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Azoospermia factor (AZF) is one of several proteins or their genes, which are coded from the AZF region on the human male Y chromosome. Deletions in this region are associated with inability to produce sperm. Subregions within the AZF region are AZFa, AZFb and AZFc. AZF microdeletions are one of the major causes of male infertility for azoospermia and severe oligozoospermia males. AZF is the term used by the HUGO Gene Nomenclature Committee.
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