Junien C, de Grouchy J, Turleau C, Serville F
Ann Genet. 1980;23(2):89-90.
Peptidase A (PepA) activity was measured in five patients with trisomy or monosomy of the distal portion of 18q. The ratio propositus/mean parent (sum of the values of the father and mother divided by two) showed a gene dosage effect, confirming the localization of the gene in 18q23.