proposed that there was a specific ring D syndrome and Ailderdice et al (1969) widened this concept to a specific 13q-syndrome since one of their cases had a straight 13q - deletion and the other a 13r. It is also likely that in the cases of Lejeune et al (1968) a 13 chromosome was the member of the D group involved.
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Grace et al. (1971) studied this question.
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