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Diagram of spermatogenesis initiated with the mitotic proliferation of spermatogonia (SSC; 2n) followed by first meiotic (I) division resulting in the formation of primary and secondary spermatocytes (SP). Through meiotic division (II), 2° SPs generate haploid round spermatids (RS) entering the differentiation process of spermiogenesis to produce elongating spermatids (ES) and mature sperm.
