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PubMed1993

The cytoplasmic tail of lysosomal acid phosphatase contains overlapping but distinct signals for basolateral sorting and rapid internalization in polarized MDCK cells.

Lysosomal acid phosphatase (LAP) is synthesized as a type I membrane glycoprotein and targeted to lysosomes via the plasma membrane. Its cytoplasmic tail harbours a tyrosine-containing signal for rapid internalization. Expression in Madine-Darby canine kidney cells results in direct sorting to the basolateral cell surface, rapid endocytosis and delivery to lysosomes. In contrast, a deletion mutant lacking the cytoplasmic tail is delivered to the apical plasma membrane where it accumulates before it is slowly internalized. A chimeric protein, in which the cytoplasmic tail of LAP is fused to the extracytoplasmic and transmembrane domain of the apically sorted haemagglutinin, is sorted to the basolateral plasma membrane. A series of truncation and substitution mutants in the cytoplasmic tail was constructed and comparison of their polarized sorting and internalization revealed that the determinants for basolateral sorting and rapid internalization reside in the same segment of the cytoplasmic tail. The cytoplasmic factors decoding these signals, however, tolerate distinct mutations indicating that different receptors are involved in sorting at the trans-Golgi network and at the plasma membrane.

Acid Phosphatase↗

PubMed1991

A molecular dissection of the carboxyterminal tails of the major neurofilament subunits NF-M and NF-H.

We have initiated a multidisciplinary project that aims to dissect and ultimately define the functions of the long and unusual C-terminal "tail" sequences of the two high molecular weight neurofilament subunits, NF-M and NF-H. A series of recombinant fusion proteins containing selected NF-M and NF-H tail sequences were constructed using appropriate cDNAs. These fusion proteins were used to further define the epitopes for a variety of widely used neurofilament antibodies, including NN18 and N52, which are now available commercially from several companies. We also measured the SDS-PAGE mobility of the fusion proteins and found that, like the native neurofilament tails, the fusion proteins ran considerably slower than predicted from their molecular weight. Since all fusion proteins produced so far exhibit this characteristic we conclude that all segments of the NF-M and NF-H tail share this unusual property. Finally we were able to produce novel and potentially useful polyclonal and monoclonal antibodies to selected segments of NF-M and NF-H sequence. These antibody studies showed that the extreme C-termini of NF-M and NF-H are immunologically absolutely distinct from one another and also indicate that the extreme C-terminus of NF-M is immunologically much more conserved than the analogous region of NF-H. These findings are in complete agreement with our conclusions derived from amino acid sequence analysis, and further underline the possible functional importance of the extreme C-terminus of NF-M. We also show that the unusual immunological properties of the bovine NF-M tail we have previously observed do not extend to the extreme C-terminal region, which appears immunologically no different from the analogous region of other NF-M molecules. The peculiarities of bovine NF-M could be explained by the presence of a KSP motif that resembles the NF-H KSP prototype.

Animals↗

PubMed2005

A severe peak tailing of phosphate compounds caused by interaction with stainless steel used for liquid chromatography and electrospray mass spectrometry.

A severe peak tailing was observed for adenosine 5'-monophosphate in flow injection analysis with stainless steel tubing and water/methanol mixture (1:1, v/v) as carrier. The cause of the peak tailing was investigated by focusing on the chemical structure of the analytes, the material used for the analytical systems and the composition of the carrier. We clarified that the peak tailing was caused by the interaction between phosphate residues in the analytes and stainless steel. The severe peak tailing did not occur with stainless steel tubing when the phosphate compounds were analyzed with carrier containing phosphoric acid or phosphate buffer. The findings indicate that such ill peak profiles are usually not considerable in conventional HPLC separation because phosphoric acid or phosphate buffer is quite commonly used in eluents. In LC-MS, however, the use of phosphoric acid and phosphate buffer is usually avoided because of their non-volatility; therefore this interaction between stainless steel and phosphate compound becomes predominant and results in severe peak tailings. We also found an effective method for avoiding the interaction. When stainless parts, such as LC tubing and ESI spray capillary, were treated with phosphoric acid prior to analysis, the peak profiles of the phosphate compounds were dramatically improved, even when non-phosphate buffer is used as carrier.

Chromatography, Liquid↗

PubMed1986

Effect of mitomycin C on the neural tube defects of the curly-tail mouse.

Around 60% of the mouse mutants called curly-tail, have tail aberrations in the form of a coil or a kink, with or without lumbosacral spina bifida, and rarely, exencephaly. These neural tube defects (NTD) are the result of an incompletely penetrant recessive gene. A single injection of various doses (1-6 mg/kg) of the DNA inhibitor mitomycin C was given to pregnant curly-tail mice on day 7, 8, or 9 of gestation, and its effect on the NTD of the embryos was noted. No dose used was lethal to the embryo. When given on day 7 or day 8, mitomycin C markedly increased the number of exencephalics, and additionally, on day 8, it reduced the number of posterior abnormalities. However, on day 9, no exencephaly was produced, and there was a drastic reduction in the number of tail and spinal defects, the overall incidence of NTD being as low as 15% with 2 mg/kg. A twofold effect of mitomycin C on the curly-tail embryos was thus observed--according to the time in development it was administered, firstly, a teratogenic effect, and later, a "remedial" or preventive effect.

Animals↗

PubMed1995

Rapid turnover and impaired cell-surface expression of the human folate receptor in mouse L(tk-) fibroblasts, a cell line defective in glycosylphosphatidylinositol tail synthesis.

The human folate receptor (hFR) is a plasma membrane protein that is anchored to the membrane via a glycosylphosphatidylinositol (GPI) tail in some cell types. The KB hFR cDNA sequence predicts a hydrophobic, alpha-helical 31-residue carboxyl terminus that is thought to be the signal for cleavage and attachment of the GPI tail. Alternatively, this region may serve as a transmembrane domain if GPI attachment is not efficient. In this study, we investigated the latter possibility by expressing the hFR in L(tk-) cells, cells that are unable to synthesize GPI tails for attachment to membrane proteins. We also transfected the same hFR cDNA into Chinese hamster ovary (CHO) cells, cells that can anchor proteins by either a GPI tail or a transmembrane domain. Neither parental cell line expresses detectable levels of folate receptor as determined by folic acid binding assays, Western analysis, or Northern analysis. In L(tk-) cells, we found that the recombinant hFR is not expressed on the cell surface, but is rapidly degraded (t1/2 < or = 4 h). Most (> 95%) of the recombinant hFR remains Endo H sensitive, suggesting retention in the endoplasmic reticulum. In contrast, transfected CHO cells express functional hFR protein at the cell surface, the half-life of the hFR is long (t1/2 > or = 24 h), and the Endo H glycosylation pattern of the recombinant hFR is consistent with normal processing through the Golgi apparatus. Therefore, in the absence of a GPI tail, the hFR is not sorted to the cell surface and the incompletely processed hFR protein is unstable.

Animals↗

PubMed2000

Influence of the histidine tail on the structure and activity of recombinant chlorocatechol 1,2-dioxygenase.

We present two efficient expression systems for the chlorocatechol 1, 2-dioxygenase (CCD) from Pseudomonas putida. In the first, CCD (encoded by the clcA gene) was expressed in the pETCLCA vector with the addition of an N-terminal histidine tail. After purification, the enzyme (CCD 6xHis) was proteolytically cleaved with thrombin to remove the His tail. The CD spectra of the cleaved and uncleaved enzymes present only minor differences, indicative of correct protein folding. However, the activity of CCD 6xHis, over a wide range of pH, was typically five times lower. This may be the result of steric hindrance caused by the histidine tail. These data are consistent with results obtained using an alternative construct employing a vector which produces a protein product devoid of the His tail. These results suggest that the His tail may induce subtle effects close to the active site which compromise the recovery of full biological activity.

Amino Acid Sequence↗

PubMed1995

Addition of a 29 residue carboxyl-terminal tail converts a simple HMG box-containing protein into a transcriptional activator.

Human mitochondrial transcription factor A (h-mtTFA) is essential for initiation of transcription from the two promoters located in the displacement-loop region of human mitochondrial DNA. This 25 kDa protein contains two tandem, HMG box DNA-binding domains separated by a 27 amino acid residue linker region and followed by a 25 residue carboxyl-terminal tail; both the linker and tail are rich in basic amino acid residues. Mutational analysis of h-mtTFA revealed that the tail region is important for specific DNA recognition and essential for transcriptional activation. The critical role of the human tail in transcription was confirmed by constructing chimeric proteins that exchanged similar regions between h-mtTFA and its Saccharomyces cerevisiae homolog, sc-mtTFA. Wild-type sc-mtTFA is unable to activate transcription from the human mitochondrial light-strand promoter (LSP). Addition of the human tail region to sc-mtTFA conferred LSP-specific promoter activation. In all of the different h-mtTFA mutations tested, transcriptional activation was correlated with specific DNA-binding activity, suggesting that these two functions may be inseparable, a situation entirely consistent with previous mutational analyses of human mitochondrial promoters.

Base Sequence↗

PubMed1983

A structural role for dihydropteroyl hexaglutamate in the tail baseplate of various bacteriophages.

A novel non-metabolic role is proposed for dihydropteroyl hexaglutamate as a critical link binding together sub-structures of the tail of Escherichia coli bacteriophage T4. Six molecules of this folate compound have been found to be components of the complex tail baseplate of the phage particle. The baseplate is assembled using a total of at least 18 viral gene products in a series of reactions in which six wedge-like elements (each 0.7 X 10(6) daltons) bind symmetrically around a central tail plug (1.55 X 10(6) daltons) to form a flat hexagonal structure. It appears likely that the pteridine portion of the folate binds to a site on a viral-induced dihydrofolate reductase molecule, a wedge component, while the glutamate residues of the folate bind to a viral-induced thymidylate synthase molecule, a central plug component. Additionally, it appears that the folyl glutamate residues play a role in forming a flexible bond between the proximal end of the phage long tail fiber and the baseplate. Two bacteriophages attacking a quite different bacterial host, Pseudomonas syringae, have been isolated and partially characterized. Both phage strains have tail structures morphologically analogous to T4. Both were irreversibly inactivated by an enzyme which cleaves the gamma-glutamyl bonds of folyl polyglutamate. It appears that these Pseudomonas phage particles also contain a folyl poly-glutamate whose integrity is essential for their infectivity.

Escherichia coli↗

PubMed1981

Molecular cloning of the T4 genome: organization and expression of the tail fiber gene cluster 34--38.

lambda T4 derivatives that carry T4 tail fiber genes 34-38 have been isolated and characterized by genetic, structural and functional analysis. 32 lambda T4 recombinants were identified by a marker rescue screen of 310 lambda T4 clones generated by restriction of partial cytosine-containing T4 DNA with either HindIII or EcoRI and ligation into appropriately cleaved lambda vectors. These tests defined 15 recombinant classes with respect to the contiguous stretches of genome recovered. Restriction enzyme structural analysis identified 7 HindIII fragments and 7 EcoRI fragments, established a restriction map covering about 11 kb, and indicated the orientation of the DNA inserts within the lambda vectors. The cloned tail fiber genes are expressed efficiently from lambda promoters and complement in vivo T4 phage carrying amber mutations in the tail fiber genes. Polypeptides corresponding to gp34--gp38 have been detected by SDS polyacrylamide gel electrophoresis of 35S-labeled extracts of appropriate lambda T4 recombinant infected UV-treated host cells. The genetic, structural and functional maps of the T4 tail fiber gene cluster have been correlated, and provide a rational approach to genetically directed DNA sequence analysis of genes 34--38 and their mutant variants that affect the assembly, structure and function of the tail fibers.

Bacteriophage lambda↗

PubMed1987

Receptor specificity of the short tail fibres (gp12) of T-even type Escherichia coli phages.

Short tail fibres of T-even like phages are involved in host recognition. To determine the specificity of the fibres, the region containing gene 12 of phages T2, K3, and K3hx was cloned. The genes 11, 12, wac, and 13, coding for the baseplate outer wedge, short tail fibres, collar wishes, and a head completion component, respectively, were localized on the cloned fragments. Plasmid-encoded gene 12 could be expressed without helper phage. Efficient expression of gene 12 from T2 and K3hx made an extraction of protein 12 possible. Hybrid phages obtained by in vitro complementation, recombination analysis and protein 12 binding to host range mutant bacteria excluded a role of the short tail fibres from T2, K3 or K3hx in the recognition of outer membrane proteins. Binding patterns of protein 12 to different Escherichia coli lipopolysaccharide mutants and inhibition of binding of protein 12 by a monoclonal antibody against the core region of E. coli K12 lipopolysaccharide suggested that heptose residues are necessary for efficient binding. The binding site of the same monoclonal antibody is different from the short tail fibre binding site in an E. coli B strain suggesting different binding specificities of protein 12. Thus, the ability of different bacterial strains to inactivate phage could be related to differences in the binding specificity of the short tail fibres for the lipopolysaccharides of these bacteria.

Base Sequence↗

PubMed1992

Allozyme and mitochondrial DNA analysis of a hybrid zone between white-tailed deer and mule deer (Odocoileus) in west Texas.

Thirty allozyme loci and 35 mitochondrial DNA (mtDNA) restriction sites were examined in 24 white-tailed deer and 46 mule deer from a hybrid zone in West Texas. A common mtDNA genotype is shared by all of the mule deer with 67% of the white-tailed deer. At the albumin locus, 13% of the white-tailed deer and 24% of the mule deer are heterozygous, sharing alleles that are otherwise species-specific in allopatric populations; 7% of the mule deer are homozygous for the allele that is characteristic of allopatric white-tailed deer. Gene flow appears to have been bidirectional, with greater genetic introgression into mule deer. The mtDNA data suggest that matings between white-tailed and mule deer have occurred in the past. Despite evidence of genetic introgression, analysis of multilocus genotypes indicates that none of the deer examined is an F1 hybrid. Production of such hybrids appears to be generally uncommon in North American deer; management plans that assume otherwise should be reconsidered.

Alleles↗

PubMedDate not supplied

On the mechanism of cesium-induced voltage and current tails in single ventricular myocytes.

The mechanisms by which different concentrations of cesium modify membrane potentials and currents were investigated in guinea pig single ventricular myocytes. In a dose-dependent manner, cesium reversibly decreases the resting potential and action potential amplitude and duration, and induces a diastolic decaying voltage tail (Vex), which increases at more negative and reverses at less negative potentials. In voltage-clamped myocytes, Cs+ increases the holding current, increases the outward current at plateau levels while decreasing it at potentials closer to resting potential, induces an inward tail current (Iex) on return to resting potential and causes a negative shift of the threshold for the inward current. During depolarizing ramps, Cs+ decreases the outward current negative to inward rectification range, whereas it increases the current past that range. During repolarizing ramps, Cs+ shifts the threshold for removal of inward rectification negative slope to less negative values. Cs+-induced voltage and current tails are increased by repetitive activity, caffeine (5 mM) and high [Ca2+]O (8.1 mM), and are reduced by low Ca2+ (0.45 mM), Cd2+ (0.2 mM) and Ni2+ (2 mM). Ni2+ also abolishes the tail current that follows steps more positive than ECa. We conclude that Cs+ (1) decreases the resting potential by decreasing the outward current at more negative potentials, (2) shortens the action potential by increasing the outward current at potentials positive to the negative slope of inward rectification, and (3) induces diastolic tails through a Ca2+-dependent mechanism, which apparently is an enhanced electrogenic Na-Ca exchange.

Action Potentials↗

PubMed2001

Ischemia/reperfusion-induced pancreatitis in rats: a new model of complete normothermic in situ ischemia of a pancreatic tail-segment.

Ischemia/reperfusion injury plays an important role in the development of graft pancreatitis and thrombosis after pancreas transplantation. Up to now there are few therapeutic options for this severe complication because very little is known about pancreatic ischemia/reperfusion injury. The same pathomechanisms may also be involved in the induction and determination of the course of acute pancreatitis. We observed the effect of 2 h of warm in situ ischemia on the postischemic tissue oxygenation, histological organ damage, and pancreatic enzymes. Experiments were performed in 21 male Wistar rats. In sham-operated animals without ischemia, the pancreas was not dissected. In the ischemia/reperfusion group a pancreatic tail-segment was carefully separated from the head, and ischemia was induced by clamping the splenic vessels for 2 h, after flushing the pancreatic tail-segment with heparinized saline. Animals treated similarly, but with opening of the clamps some seconds after induction of ischemia, served as controls. The animals were observed for 2 h after reperfusion. Tissue oxygenation was monitored by a PO2-sensitive probe (LICOX, GMS, Kiel, Germany) which was implanted into the pancreatic tissue. Blood samples were taken before, 5 min, 60 min, and 120 min after reperfusion. At the end of the experiment the pancreatic tail was excised for histological examination; biopsies froin the non-ischemic pancreatic head served as intraindividual control to exclude side effects on the nonischemic pancreatic head. In the ischemia/reperfusion group, PO2ti was significantly lower 1 h (18.0+/-1.7 mmHg) and 2 h (16.4+/-1.6 mmHg) after reperfusion compared with baseline conditions (32.8+/-5.2 mmHg) and the control group (1 h 30.6+/-1.9 mmHg, 2 h 32.4+/-2.4 mmHg). Histological injury score and plasma lipase activity were significantly higher in the ischemia/reperfusion group compared with the control group. Thus we describe a new experimental model of complete normothermic in situ ischemia of a pancreatic tail-segment with the possibility of flushing the pancreatic tail-segment and selective local application of drugs to the pancreas.

Animals↗

PubMed2002

Rat hindlimb unloading by tail suspension reduces osteoblast differentiation, induces IL-6 secretion, and increases bone resorption in ex vivo cultures.

In this research we utilized tail-suspended rats as an in vivo model for bone loss studies in order to investigate the effects of the tail suspension on the structure of the suspended bones and in ex vivo cultures the activities of trabecular osteoblasts, marrow-derived osteogenic cells, and osteoclasts obtained from treated animals, compared with untreated controls. After a 5-day hind limb unloading, trabecular thinning was already evidenced in the tibial primary spongiosa. In the secondary spongiosa, the bone formation activity was reduced whereas osteoclastic parameters were not yet altered. Bone marrow-derived osteogenic cells and differentiated osteoblasts from enzymatic digestion of posterior limb trabecular bone were prepared from 5 day tail-suspended rats and from normally loaded rats as controls. Cell morphology, alkaline phosphatase (ALPH) activity, production of mineral matrix, osteocalcin, and IL-6 secretion were evaluated in both cell populations. Tail suspension reduced the osteogenic potential of stromal marrow cells and of already differentiated osteoblasts. In fact, ALP positive colonies were significantly reduced in number and were smaller in size compared with controls and bone nodules formed in permissive conditions were also significantly fewer and smaller, whereas in cultures of cells from control conditions, large mineralizing nodules were formed. Osteocalcin secretion was not affected by unloading. Finally, IL-6 concentration was increased in marrow-derived cells from treated rats compared with controls. Primary cultures of osteoclasts were obtained from the nonadherent fraction of the bone marrow of the same animals. The number of TRAP positive cells in culture from tail-suspended rats was significantly increased, as well as bone resorption activity, measured as resorbed surfaces of a suitable synthetic hydroxyapatite, compared with controls. These data clearly suggest that skeletal unloading not only reduces the osteogenic potential of osteoblastic cells but induces an increased osteoclastogenesis and osteoclast activity in ex vivo cultures. They also indicate for the first time that a possible mediator responsible for the increased osteoclastogenesis could be represented by the IL-6 whose secretion by bone marrow cells was significantly enhanced by unloading.

Alkaline Phosphatase↗

PubMed1999

Characterization of Mhc-DRB allelic diversity in white-tailed deer (Odocoileus virginianus) provides insight into Mhc-DRB allelic evolution within Cervidae.

Although white-tailed deer (Odocoileus virginianus) are one of North America's best studied mammals, no information is available concerning allelic diversity at any locus of the major histocompatibility complex in this taxon. Using the polymerase chain reaction, single-stranded conformation polymorphism analysis, and DNA sequencing techniques, 15 DRB exon 2 alleles were identified among 150 white-tailed deer from a single population in southeastern Oklahoma. These alleles represent a single locus and exhibit a high degree of nucleotide and amino acid polymorphism, with most amino acid variation occurring at positions forming the peptide binding sites. Furthermore, twenty-seven amino acid residues unique to white-tailed deer DRB alleles were detected, with 19 of these occurring at residues forming contact points of the peptide binding region. Significantly higher rates of nonsynonymous than synonymous substitutions were detected among these DRB alleles. In contrast to other studies of Artiodactyla DRB sequences, interallelic recombination does not appear to be playing a significant role in the generation of allelic diversity at this locus in white-tailed deer. To examine evolution of white-tailed deer (Odvi-DRB) alleles within Cervidae, we performed a phylogenetic analysis of all published red deer (Ceel-DRB), roe deer (Caca-DRB), and moose (Alal-DRB) DRB alleles. The phylogenetic tree clearly shows a trans-species persistence of DRB lineages among these taxa. Moreover, this phylogenetic tree provides insight into evolution of DRB allelic lineages within Cervidae and may aid in assignment of red deer DRB alleles to specific loci.

Alleles↗

PubMed2003

Effects of fish introduction on the length of the tail of cryptomonads in mesocosm experiments.

Two different morphs of the small cryptomonad, Plagioselmis prolonga var. nordica with a posterior tail, were observed during summer and fall in the hypertrophic lake, Lake Kasumigaura, Japan. The tail shortened in mesocosms stocked with planktivorous silver carp ( Hypophthalmichthys molitrix Val.) and elongated by more than 50% in mesocosms from which silver carp were removed. The density of Plagioselmis cells increased significantly upon fish stocking and decreased upon fish removal. The tail length was negatively correlated with algal abundance and positively correlated with crustacean densities, but there was no correlation with nutrient levels or physical environmental parameters in the mesocosms. The variation in tail length was induced by the presence/absence of fish, but was not related to their density. However, silver carp manipulation strongly affected the density of the majority of zooplankters and, interestingly, there was a strong correlation between zooplankton density and tail-length change in Plagioselmis. We propose a possible herbivore-induced defense mechanism triggered by the top predator, silver carp.

Adaptation, Biological↗

PubMed2000

Usefulness of pig-tail catheter for palliative drainage of malignant pleural effusions in cancer patients.

We retrospectively collected data from patients enrolled between 1996 and 1997, to evaluate the efficacy of sono-guided pig-tail-catheter drainage in cancer patients with large, symptomatic, amounts of malignant effusion and to evaluate the hemodynamic change after effusion drainage. A total of 477 pig-tail catheter drainage procedures were performed on 342 cancer patients. Sonographic findings, volume drained within 36 h after pig-tail insertion, heart rate and respiratory rate 24 h before and after drainage, and dyspnea sensations were recorded. We found that unilateral right-side effusion was the most frequent presentation. The mean amount of effusion drained within 36 h was 1,747 ml in cancer patients. The decreases in heart rate (from 97/min to 91/min) and in respiratory rate (from 23/min to 21/min) were both statistically significant. There was no significant correlation between the amount of effusion before drainage and the heart rate or respiratory rate. The amount drained within 36 h was correlated significantly with the changes in heart and respiratory rates. Dyspnea sensations decreased or subsided in 91% of the patients within this time period. There were few complications with the pig-tail drainage procedure. Sono-guided pig-tail drainage is a safe and convenient method of effusion drainage in cancer patients. It not only provides temporary relief of symptoms from massive pleural effusions, but can also be used for pleurodesis if needed.

Adolescent↗

PubMed2004

Inflammatory tumor in pancreatic tail induced by endoscopic ablation with cyanoacrylate glue for gastric varices.

A 65-year-old Japanese man was hospitalized with back pain in April 1998. At age 63 years, endoscopic ablation with cyanoacrylate glue had been performed for bleeding gastric varices. At the time of the present admission, a low-density mass (about 23 mm in diameter) was seen in the tail of the pancreas, and splenic vein occlusion and collateral veins were revealed on computed tomography. A hypoechoic tumor (about 22 mm in diameter) and splenic vein occlusion were clearly visualized on the pancreas tail via endoscopic ultrasonography. Venous phase of the splenic arteriogram revealed a completely occluded splenic vein in the hilus of the spleen. Thus, the patient was diagnosed with pancreatic cancer (stage I: T2N0M0). A surgical resection of the pancreatic tumor was performed, and a pancreatic tail resection with part of stomach around the pancreas tail, and splenectomy, were selected for this patient, in June 1998. Histopathological examination of the resected tumor revealed capsuled abscess formation with foreign body reaction between the stomach and the pancreas tail, and necrosis was present in the pancreas around the abscess. There were some deposits of cyanoacrylate glue in the tumor. The mass was considered to be an inflammatory tumor. In summary, this case of inflammatory pancreas tumor is a novel complication after endoscopic obliterative therapy with cyanoacrylate glue.

Aged↗