DAZ1 and Azoospermia: The important candidate genes inthis deletion interval are four copies of the DAZ(deleted in azoospermia), three copies of BPY2(basic protein on Y chromosome 2) and two copiesof CDY1 (CDY1a and CDY1b; chromodomainprotein, Y chromosome 1) gene family (45, 46).The first identified and well-studied AZFc genewas DAZ.