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PubMed1995

Molecular cloning and characterization of cDNA encoding the alpha subunit of the rat protein synthesis initiation factor eIF-2B.

Eukaryotic initiation factor 2B (eIF-2B) is an essential component of the pathway of peptide-chain initiation in mammalian cells, yet little is known about its molecular structure and regulation. To investigate the structure, regulation, and interactions of the individual subunits of eIF-2B, we have begun to clone, characterize, and express the corresponding cDNAs. We report here the cloning and characterization of a 1510-bp cDNA encoding the alpha subunit of eIF-2B from a rat brain cDNA library. The cDNA contains an open reading frame of 918 bp encoding a polypeptide of 305 aa with a predicted molecular mass of 33.7 kDa. This cDNA recognizes a single RNA species approximately 1.6 kb in length on Northern blots of RNA from rat liver. The predicted amino acid sequence contains regions identical to the sequences of peptides derived from bovine liver eIF-2B alpha subunit. Expression of this cDNA in vitro yields a peptide which comigrates with natural eIF-2B alpha in SDS/polyacrylamide gels. The predicted amino acid sequence exhibits 42% identity to that deduced for the Saccharomyces cerevisiae GCN3 protein, the smallest subunit of yeast eIF-2B. In addition, expression of the rat cDNA in yeast functionally complements a gcn3 deletion for the inability to induce histidine biosynthetic genes under the control of GCN4. These results strongly support the hypothesis that mammalian eIF-2 alpha and GCN3 are homologues. Southern blots indicate that the eIF-2B alpha cDNA also recognizes genomic DNA fragments from several other species, suggesting significant homology between the rat eIF-2B alpha gene and that from other species.

Amino Acid Sequence↗
PubMed1995

Cloning and functional expression of a thyrotropin receptor cDNA from rat fat cells.

Thyrotropin receptor (TSH-R) has been thought to be thyroid-specific, but, by Northern blot analysis, we found that rat adipose tissue expressed TSH-R mRNAs in amounts approaching those in the thyroid. To investigate the function of TSH-R from adipose tissue, we screened a rat fat cell lambda gt11 cDNA library for TSH-R sequences using a 32P-labeled rat thyroid TSH-R cDNA as a probe. Among 10(6) plaques, we obtained four positive clones. Sequencing of these cDNAs has revealed that two of them (F alpha and F beta) contained both initiation and termination codons. Comparison of F alpha with the thyroid TSH-R cDNA sequence revealed that F alpha was almost identical to the thyroid TSH-R, except that nucleotides 1041 and 1277 were changed from A to G and from C to T, respectively. In contrast, we found that F beta contained 21 novel nucleotides between nucleotides 467 and 468 of the thyroid TSH-R cDNA, encoding an additional 7 amino acids. However, when we prepared mRNA from adipose tissue and transcribed it into cDNA, we failed to amplify the F beta type of TSH-R cDNA by polymerase chain reaction, suggesting that F beta mRNAs are rare in the tissue. We then ligated F cDNAs into pSG5 and transfected them with pSV2-neo into Chinese hamster ovary (CHO)-K1 cells. TSH stimulated cAMP formation in CHO-F alpha cells in a manner similar to that in CHO cells transfected with thyroid TSH-R cDNA. In contrast, no increase of cAMP was observed in CHO-F beta cells. IgG from patients with Graves' disease (n = 4) showed thyroid-stimulating antibody activity only in CHO-F alpha cells (1288-4582%). In addition, CHO-F alpha cells and CHO cells transfected with thyroid TSH-R showed similar 125I-TSH binding activity. These results indicate that the fat cell expresses high levels of a TSH-R whose function is indistinguishable from that in the thyroid and suggest that the TSH-R autoantibody plays an important role in the pathogenesis of the extrathyroidal manifestations of Graves' disease.

Adipose Tissue↗
PubMed1995

Splicing isoforms of rat Ash/Grb2. Isolation and characterization of the cDNA and genomic DNA clones and implications for the physiological roles of the isoforms.

We obtained three types of cDNA clones homologous to Ash/Grb2(Ash-l) cDNA from rats. One of these clones, Ash-psi, was an unusual transcribed gene having 93% identity in the nucleotide sequence to Ash-l. The other two clones, Ash-m and -s, had nucleotide sequences identical with Ash-l cDNA in the amino-terminal region. The coding sequence of Ash-m cDNA is 42 nucleotides shorter than that of Ash-l cDNA. The defective region of Ash-m cDNA encodes 14 amino acid residues (157 to 170 of Ash-l), which comprise the most conserved region of the second SH3 domain. On the other hand, the coding sequence of Ash-s terminated at the end of the first SH3 domain due to a stop codon at the boundary of the sequence, thereby differing from Ash-l cDNA. Cloning of the genomic DNA of the Ash-l-encoding gene, determination of the gene organization, and nucleotide sequencing revealed that the two isoforms, as well as Ash-l, are generated from a single gene by unusual alternative splicings. The gene spans more than 16 kilobases and contains 6 exons and 5 introns. Ash-m and Ash-s mRNAs were detected in various tissues by reverse-transcribed polymerase chain reaction. Ash-m physically associated with dynamin, but the association with Sos was less effective than that of Ash-l in rat pheochromocytoma PC12 cell lysates, irrespective of treatment with nerve growth factor. In contrast, Ash-s formed a complex with dynamin and Sos in cell lysates. Moreover, the newly formed carboxyl-terminal SH3 of Ash-m by splicing bound different proteins from those bound to the carboxyl-terminal SH3 domain of Ash-l, suggesting that Ash-m generates different signals. Microinjection of Ash-m or Ash-s into Balb/c 3T3 cells inhibited DNA synthesis induced by platelet-derived growth factor. These results show that these isoforms act as dominant negative regulators of mitogenic signals by Ash-l.

Adaptor Proteins, Signal Transducing↗
PubMed1998

Increment of efficiency in the identification of noble genes by colony hybridization assay. (Screening of low redundant clones from human fetal cDNA library).

For the rapid identification of noble genes in a specific tissue by computer analysis from the cDNA sequences determined by single-pass cDNA sequencing, clone redundancy was one of the major obstacles. To facilitate the efficiency in identification of noble genes, it was necessary to reduce the number of clones to be sequenced by eliminating the redundant clones for a rapid analysis. In order to increase the probability of isolating noble sequences from the cDNA clones of human fetal liver tissue origin, colony hybridization assay was adopted and redundant clones were efficiently removed. Four cDNA clones highly redundant in the human fetal liver cDNA libraries including alpha-globin, gamma-globin, serum albumin and H19 RNA sequences were selected as the probes. Two hundreds and sixty two cDNA clones were randomly selected and tested with the probes for hybridization properties. The identity of each cDNA clone giving positive or negative signals in the hybridization assay was determined by DNA homology search with the nucleic acid databases. Among the 76 clones giving positive signals, 57 clones (75%) were found to be identical to the probe sequences and could be eliminated by colony hybridization assay before neucleotide sequencing.

Cloning, Molecular↗
PubMed1987

Isolation and characterization of cDNA clones for rat ribophorin I: complete coding sequence and in vitro synthesis and insertion of the encoded product into endoplasmic reticulum membranes.

Ribophorins I and II are two transmembrane glycoproteins that are characteristic of the rough endoplasmic reticulum and are thought to be part of the apparatus that affects the co-translational translocation of polypeptides synthesized on membrane-bound polysomes. A ribophorin I cDNA clone containing a 0.6-kb insert was isolated from a rat liver lambda gtll cDNA library by immunoscreening with specific antibodies. This cDNA was used to isolate a clone (2.3 kb) from a rat brain lambda gtll cDNA library that contains the entire ribophorin I coding sequence. SP6 RNA transcripts of the insert in this clone directed the in vitro synthesis of a polypeptide of the expected size that was immunoprecipitated with anti-ribophorin I antibodies. When synthesized in the presence of microsomes, this polypeptide, like the translation product of the natural ribophorin I mRNA, underwent membrane insertion, signal cleavage, and co-translational glycosylation. The complete amino acid sequence of the polypeptide encoded in the cDNA insert was derived from the nucleotide sequence and found to contain a segment that corresponds to a partial amino terminal sequence of ribophorin I that was obtained by Edman degradation. This confirmed the identity of the cDNA clone and established that ribophorin I contains 583 amino acids and is synthesized with a cleavable amino terminal insertion signal of 22 residues. Analysis of the amino acid sequence of ribophorin I suggested that the polypeptide has a simple transmembrane disposition with a rather hydrophilic carboxy terminal segment of 150 amino acids exposed on the cytoplasmic face of the membrane, and a luminal domain of 414 amino acids containing three potential N-glycosylation sites. Hybridization measurements using the cloned cDNA as a probe showed that ribophorin I mRNA levels increase fourfold 15 h after partial hepatectomy, in confirmation of measurements made by in vitro translation of liver mRNA. Southern blot analysis of rat genomic DNA suggests that there is a single copy of the ribophorin I gene in the haploid rat genome.

Amino Acid Sequence↗
PubMed2003

Technical advances: genome-wide cDNA-AFLP analysis of the Arabidopsis transcriptome.

cDNA-AFLP, a technology historically used to identify small numbers of differentially expressed genes, was adapted as a genome-wide transcript profiling method. mRNA levels were assayed in a diverse range of tissues from Arabidopsis thaliana plants grown under a variety of environmental conditions. The resulting cDNA-AFLP fragments were sequenced. By linking cDNA-AFLP fragments to their corresponding mRNAs via these sequences, a database was generated that contained quantitative expression information for up to two-thirds of gene loci in A. thaliana, ecotype Ws. Using this resource, the expression levels of genes, including those with high nucleotide sequence similarity, could be determined in a high-throughput manner merely by comparing cDNA-AFLP profiles with the database. The lengths of cDNA-AFLP fragments inferred from their electrophoretic mobilities correlated well with actual fragment lengths determined by sequencing. In addition, the concentrations of AFLP fragments from single cDNAs were highly correlated, illustrating the validity of cDNA-AFLP as a quantitative, genome-wide, transcript profiling method. cDNA-AFLP profiles were also qualitatively consistent with mRNA profiles obtained from parallel microarray analysis, and with data from previous studies.

Arabidopsis↗
PubMed2005

Evaluation of experimental designs for two-color cDNA microarrays.

The major goal of two-color cDNA microarray experiments is to measure the relative gene expression level (i.e., relative amount of mRNA) of each gene between samples in studies of gene expression. More specifically, given an N-sample experiment, we need all N(N - 1)/2 relative expression levels of all sample pairs of each gene for identification of the differentially expressed genes and for clustering of gene expression patterns. However, the intensities observed from two-color cDNA microarray experiments do not simply represent the relative gene expression level. They are composed of signal (gene expression level), noise, and other factors. In discussions on the experimental design of two-color cDNA microarray experiments, little attention has been given to the fact that different combinations of test and control samples will produce microarray intensities data with varying intrinsic composition of factors. As a consequence, not all experimental designs for two-color cDNA microarray experiments are able to provide all possible relative gene expression levels. This phenomenon has never been addressed. To obtain all possible relative gene expression levels, a novel method for two-color cDNA microarray experimental design evaluation is necessary that will allow the making of an accurate choice. In this study, we propose a model-based approach to illustrate how the factor composition of microarray intensities changed with different experimental designs in two-color cDNA microarray experiments. By analyzing 12 experimental designs (including 5 general forms), we demonstrate that not all experimental designs are able to provide all possible relative gene expression levels due to the differences in factor composition. Our results indicate that whether an experimental design can provide all possible relative expression levels of all sample pairs for each gene should be the first criterion to be considered in an evaluation of experimental designs for two-color cDNA microarray experiments.

Animals↗
PubMed1984

Chromogenic immunodetection of human serum albumin and alpha-L-fucosidase clones in a human hepatoma cDNA expression library.

A human hepatoma cDNA library was constructed in lambda gt11, a bacteriophage vector that was designed to express cDNA-encoded antigenic determinants in Escherichia coli. The cDNA expression library contained approximately 8 X 10(6) recombinant phages with an average insert size of 780 bp. The feasibility of using a chromogenic immunodetection procedure to isolate cDNA clones was proved by isolating a human serum albumin (HSA) cDNA clone. An approximately 1.0-kb cDNA clone was then isolated by screening the library with rabbit anti-human alpha-L-fucosidase antibodies. The identity of the alpha-L-fucosidase cDNA clone was confirmed by DNA sequence analysis and a comparison of the predicted amino acid sequence to the amino acid sequences of human alpha-L-fucosidase tryptic peptides.

Bacteriophage lambda↗
PubMed1982

Cloning and nucleotide sequence analysis of human embryonic zeta-globin cDNA.

Clones of human embryonic alpha-like zeta-globin cDNA were isolated, by detection using cross-hybridization to human alpha-globin cDNA probes, from a cDNA library derived from the mRNA of the human erythroleukemia cell line K562. Nucleotide sequence analysis of these cDNA clones revealed a coding sequence that corresponds perfectly to the independently derived amino acid sequence of the human zeta-globin chain. Comparison of the nucleotide sequence of human zeta-globin cDNA with that of human alpha-globin cDNA confirmed previous estimates of very distant evolutionary divergence between the human zeta- and alpha-globin genes. Nevertheless, the human zeta-globin cDNA sequence shares a remarkable similarity to that of the alpha-globin gene in its codon usage, high G + C base composition, and lack of bias against usage of CG dinucleotides.

Base Composition↗
PubMed2003

Prediction of the coding sequences of mouse homologues of KIAA gene: III. the complete nucleotide sequences of 500 mouse KIAA-homologous cDNAs identified by screening of terminal sequences of cDNA clones randomly sampled from size-fractionated libraries.

We have conducted a human cDNA project to predict protein-coding sequences (CDSs) in large cDNAs (> 4 kb) since 1994, and the number of newly identified genes, known as KIAA genes, already exceeds 2000. The ultimate goal of this project is to clarify the physiological functions of the proteins encoded by KIAA genes. To this end, the project has recently been expanded to include isolation and characterization of mouse KIAA-counterpart genes. We herein present the entire sequences and the chromosome loci of 500 mKIAA cDNA clones and 13 novel cDNA clones that were incidentally identified during this project. The average size of the 513 cDNA sequences reached 4.3 kb and that of the deduced amino acid sequences from these cDNAs was 816 amino acid residues. By comparison of the predicted CDSs between mouse and human KIAAs, 12 mKIAA cDNA clones were assumed to be differently spliced isoforms of the human cDNA clones. The comparison of mouse and human sequences also revealed that four pairs of human KIAA cDNAs are derived from single genes. Notably, a homology search against the public database indicated that 4 out of 13 novel cDNA clones were homologous to the disease-related genes.

Animals↗
PubMed1996

Transcript map of the human chromosome 4p16.3 consisting of 627 cDNA clones derived from 1 Mb of the Huntington's disease locus.

Six hundred and twenty-seven cDNA clones from human brain cDNA libraries were characterized and integrated into a transcript map of the 1-Mb region on human chromosome 4p16.3 containing the Huntington's disease (HD) gene. Six hundred and seventy-two cDNA clones were obtained by a direct screening of the cDNA libraries, probing with pools of single copy microclones generated from the HD region specific yeast artificial chromosome (YAC)-DNA. So far, 93% of the obtained clones (627 cDNA clones) have been mapped onto the 1-Mb HD gene region by hybridization with HD region-specific cosmid, P1 and YAC clones. DNA sequence and expression analyses revealed that several cDNA clones might encode novel genes, some of which are situated within or close to the IT15, IT11, and alpha-adducin (ADD1) gene region, suggesting the presence of the overlapping genes in this region. This collection of cDNA clones will greatly facilitate the construction of the complete map of the transcripts in the HD region.

Animals↗
PubMed2001

Prediction of the coding sequences of unidentified human genes. XXI. The complete sequences of 60 new cDNA clones from brain which code for large proteins.

As an extension of a sequencing project of human cDNA clones which encode large proteins of unidentified genes, we herein present the entire sequences of 60 cDNA clones for the genes named KIAA1879-KIAA1938. The cDNA clones were isolated from size-fractionated cDNA libraries derived from human fetal brain, adult whole brain and amygdala, and their protein-coding sequences were predicted. Thirty-seven cDNA clones entirely sequenced in this study were selected as cDNAs which have coding potentiality by in vitro transcription/translation experiments, and the remaining 23 cDNA clones were chosen by computer-assisted analysis of terminal sequences of cDNAs. The average sizes of the inserts and corresponding open reading frames of cDNA clones analyzed here were 4.5 kb and 2.2 kb (733 amino acid residues), respectively. Sequence analyses against the public databases enabled us to annotate the functions of the predicted products of the 25 genes; 84% of these predicted gene products (21 gene products) were classified into proteins related to cell signaling/communication, nucleic acid management, and cell structure/motility. In addition to the sequence information about these 60 genes, their expression profiles were also studied in some human tissues including brain regions by reverse transcription-coupled polymerase chain reaction, products of which were quantified by enzyme-linked immunosorbent assay.

Adult↗
PubMed1992

Genomic organization of a cDNA (QM) demonstrating an altered mRNA level in nontumorigenic Wilms' microcell hybrid cells and its localization to Xq28.

Using a cosmid clone derived from human Xq28 as a probe which shows cross-species homology, we isolated cDNA clones and the nucleotide sequence analysis of the cDNA revealed that the cDNA is identical to QM cDNA. The QM cDNA has recently been reported as a cDNA with down-regulation in tumorigenic Wilms' tumor microcell hybrid. Comparison of the nucleotide sequences of the cDNA with those of the genomic DNA allowed us to determine the genomic organization of the QM gene. The QM gene consists of at least 7 exons and is located at Xq28. Southern blot analysis of a somatic cell hybrid panel indicates that the QM genes are scattered at least to chromosome 2, 3, 6, 14, 16, and possibly to other chromosomes. Northern blot analysis demonstrated the QM gene is expressed in all the examined adult human tissues as well as cell lines including HeLa cells, fibroblasts, and somatic cell hybrids with increased expression in liver, spleen, testis, and adrenal gland. The results suggest that the QM gene belongs to a new multi-gene family with yet undetermined function.

Amino Acid Sequence↗
PubMed1993

Mutation induction by UV light in retroviral hprt cDNA integrated at various chromosomal positions in repair-deficient hamster cells.

Mutation induction by UV irradiation was studied in a retroviral vector integrated in one copy per cell at various chromosomal positions. As a mutational target, hamster hprt cDNA was present on the retroviral vector. To minimize the influence of repair we used repair-deficient hamster cells, V-H1 and UV5, as a recipient for the vector. There is no major influence of chromosomal position on UV-induced mutation frequency and spectrum because no statistically significant difference between mutation induction in retroviral cDNA copies integrated at different chromosomal sites was observed. However, a major difference was found in mutation induction between the endogenous hamster hprt gene and the retroviral cDNA copies. Most noticeable was the absence in the cDNA of the strong strand bias for mutation induction, which was reported for the endogenous hprt gene. Our results with the hprt cDNA exclude as a general phenomenon a difference in mutation induction for leading and lagging strand DNA replication, which was proposed as an explanation for this strand bias in the endogenous gene. The similarity of mutation induction in the different retroviral cDNA copies, all directly surrounded by the same DNA sequence elements, together with the marked difference between the mutation induction in the endogenous gene and the cDNA copies may point to an important role of chromatin structure in mutation induction.

Animals↗
PubMed1982

Chicken histone H5: selection of a cDNA recombinant using an extended synthetic primer.

We describe the use of a synthetic primer to select a cDNA recombinant clone containing H5 coding sequences. The strategy used was as follows: 1. Prepare oligo(dT) cellulose-bound mRNA from chicken reticulocytes and select 11S-18S material from sucrose gradients. 2. Use this RNA fraction both to prepare a cDNA library and as a template for H5-specific cDNA synthesis using a synthetic primer. 3. Screen out most globin cDNA recombinants with oligo(dT)-primed globin cDNA. 4. Search for H5 recombinants using H5 specific cDNA and verify the identity by DNA sequencing. Our screening suggests an H5 mRNA abundance of about two parts per thousand in chicken reticulocyte poly(A)-containing RNA. The isolation of an H5 cDNA recombinant clone is an initial step in the study of H5 genes and their relationship to H1 and core histone genes.

Amino Acid Sequence↗
PubMed1986

Cloning and expression of cDNA encoding mouse tyrosinase.

We have isolated a pigment cell-specific cDNA clone from a B16 mouse melanoma cDNA library by differential hybridization. The mRNA of isolated cDNA is highly expressed in B16 melanoma cells and in black mouse (C57BL/6) skin, but is not detectable in mouse neuroblastoma cells nor in K1735 mouse amelanotic melanoma cells. The protein sequence deduced from the nucleotide sequence of the cloned cDNA shows significant similarity to the entire region of Neurospora tyrosinase. To know the identity of cDNA, we transfected K1735 amelanotic melanoma and COS-7 cells with the cDNA carried in a simian virus 40 vector (pKCRH2). We confirmed that the isolated cDNA encodes mouse tyrosinase by immunofluorescence staining of transfected cells using two different anti-T4-tyrosinase monoclonal antibodies. Tyrosinase is composed of 513 amino acids with a molecular weight of 57,872 excluding a hydrophobic signal peptide of 24 amino acids.

Amino Acid Sequence↗
PubMed1994

Evolutionarily conserved elements in the 5' untranslated region of beta globin mRNA mediate site-specific priming of a unique hairpin structure during cDNA synthesis.

Generation of double-stranded cDNA during reverse transcription of a variety of mRNA molecules is well known to involve the formation of covalently linked antisense and sense strands in a hairpin configuration. In the present study we have examined the sequence of molecular events which occurs during cDNA synthesis from mouse beta globin mRNA, in particular the self-priming event that initiates synthesis of sense-strand DNA. Upon completion of reverse transcription of globin mRNA and the removal of RNA template by RNase H activity associated with reverse transcriptase, the 3' end of cDNA snaps back to form a stable double-stranded structure, which is extended by reverse transcriptase to generate the sense DNA strand. Surprisingly, the fourteen 3' terminal nucleotides of the beta globin antisense DNA strand (cDNA) have strong complementarity with an internal segment of the same molecule corresponding to a portion of the 5'-untranslated region of the mRNA located just upstream of the translation start site. Efficient second strand cDNA synthesis appears to require the occurrence within the cDNA molecule of these two complementary elements, one of which must be 3'-terminal. A second surprising feature is that the strong complementarity between the terminal and the internal portions of the molecule exists in the antisense DNA and not in the sense mRNA strand. This is because A:C mismatches on the sense strand correspond to relatively stable T:G base pairs on the antisense strand. Such an extended region of complementarity within the segment of cDNA corresponding to the short 5' untranslated region of beta globin mRNA is unlikely to occur purely by chance, suggesting some underlying function. In this regard it is of interest that cDNAs of adult beta globin mRNAs from other mammalian species show a very similar arrangement of complementary elements, and that complementarity is heavily conserved, even when there are substitutions in nucleotide sequence.

Animals↗
PubMed1998

Non-stoichiometric reduced complexity probes for cDNA arrays.

A method is presented in which the reduced complexity and non-stoichiometric amplification intrinsic to RNA arbitrarily primed PCR fingerprinting (RAP-PCR) is used to advantage to generate probes for differential screening of cDNA arrays. RAP-PCR fingerprints were converted to probes for human cDNA clones arrayed as Escherichia coli colonies on nylon membranes. Each array contained 18 432 cDNA clones from the IMAGE consortium. Hybridization to approximately 1000 cDNA clones was detected using each RAP-PCR probe. Different RAP-PCR fingerprints gave hybridization patterns having very little overlap (<3%) with each other or with hybridization patterns from total cDNA probes. Consequently, repeated application of RAP-PCR probes allows a greater fraction of the message population to be screened on this type of array than can be achieved with a radiolabeled total cDNA probe. This method was applied to RNA from HaCaT keratinocytes treated with epidermal growth factor. Two RAP-PCR probes detected hybridization to 2000 clones, from which 22 candidate differentially expressed genes were observed. Differential expression was tested for 15 of these clones using RT-PCR and 13 were confirmed. The use of this cDNA array to analyze RAP-PCR fingerprints allowed for an increase in detection of 10-20-fold over the conventional denaturing polyacrylamide gel approach to RAP-PCR or differential display. Throughput is vastly improved by the reduction in cloning and sequencing afforded by the use of arrays. Also, repeated cloning and sequencing of the same gene or of genes already known to be regulated in the system of interest is minimized. The procedure we describe uses inexpensive arrays of plasmid clones spotted as E.coli colonies to detect differential expression, but these reduced complexity probes should also prove useful on arrays of PCR-amplified fragments and on oligonucleotide chips. Genesobserved in this manuscript: H11520, U35048, R48633, H28735, M13918, H12999, H05639, X79781, M31627, H23972, AB000712, R75916, U66894, AF067817.

DNA, Complementary↗