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Expression level of four genes during the different stages of spermatogenesis. To determine the stage of spermatogenesis in which these four genes are expressed, the different male germ cell populations were separated by flow cytometry and the expression levels were measured by qRT-PCR. Undifferentiated (Udiff), differentiated (Diff) spermatogonias, primary (Cytes I) and secondary (Cytes II) spermatocytes, spermatids (Stids).
