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The role of the Y chromosome-encoded Deleted in Azoospermia (DAZ) gene family in spermatogenesis remains unclear. The ability of men without the DAZ gene to produce sperm, as well as the lack of selective pressure on DAZ exon sequences during evolution, casts doubts on its functional significance. Most men have four DAZ genes encoding protein isoforms that differ significantly in size. However, published western blots showed only a single "DAZ" band, raising the possibility that not all four DAZ genes are expressed.

Restricted expression of the human DAZ protein in premeiotic germ cells