but also as a probable cause of congenital malforma- tions In the cases of congenital malformations so far ascribed to ring chromosomes, the B group has been involved only once. However, the chromosome from which the ring was formed was thought to be a No. 5 (Rohde and Tompkins., 1965), and a ring 4 chro- mosome has not been reported.
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Carter et al. (1969) studied this question.