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A group-C ring chromosome in a mentally deficient male.

Ring chromosomes in association with different congenital anomalies have been described in a number of cases (see the review by Varela and Sternberg, 1969). A ring chromosome involving a group-C chromosome in males has only been described in three cases as far as we know: one by Turner et al (1962), and two by Atkins et al (1966). The present paper reports on one further case of a ring chromosome replacing one of the chromosomes of the C-group in a mentally deficient male.