Figure 1

A time course of spermatogenesis. Primordial germ cells (PGC’s) are the germline progenitors. They give rise to various types of spermatogonia, which proliferate and differentiate into spermatocytes. Meiosis and genetic recombination occur in spermatocytes, which become haploid spermatids after the completion of meiosis. Spermatids undergo the process of spermiogenesis until their maturity, which includes elongation, genome condensation and formation of a flagellum. The approximate timeline of the first wave of spermatogenesis in mice, in days after birth (dpp) is indicated. The figure is adopted from [45] by the authors holding the copyright.