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Promoters that are poised during fetal development remain poised during and after meiosis. (A) Schematic of meiosis in male germ cells. (B) Number of germ-line–poised genes retained across fetal time points in male only (blue) or in both male and female (purple), compared with genes identified as poised in both pachytene spermatocytes and round spermatids (“male meiotic,” green). (C) Sample gene tracks for three genes maintained in a poised state across germ cell development.
