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Spermatogenesis goes through very critically and precisely balanced ratios of germ cells with diverse DNA ploidies (1C, 2C and 4C). Antispermatogenic agents that reversibly interrupt spermatogenesis may have a contraceptive relevance. With a view to study the precise mechanism of action of antispermatogenic agents and identify the germ cell type(s) targeted by various agents in vivo, spermatogenic...