"Equivocalness" and other empirical methods in zygosity assessment.
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Biomedical subjects
Publications and source records attributed to M Milani-Comparetti.
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A previous study had shown that only MZ twins are easily exchanged by trained police dogs. This is certainly due to the superimposability of the biochemical basis of body scent. A different approach has now been tried, based on plasma protein fractionating procedures. A pilot study has shown that PolyAcrilamide Gel Electrophoresis (PAGE) results, as expected, in widely different patterns only in DZ twin pairs. Plasma specimens from a sample of 55 supposedly MZ twin pairs were analysed by PAGE. The substantial superimposability of MZ cotwin patterns was confirmed. Analysis of the different fractions indicates the extent of environmental variability. Application to zygosity determination is suggested.
A case of "G2 Deletion Syndrome" is reported, based on concordant cytogenetic, clinical and dermatoglyphic findings. The definition if the syndrome, as associated with either a ring or a partially deleted chromosome 22, is discussed. The resulting interpretation favours the hypotheses of deletion of the short arm extending into the centromere.
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