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Spermatogonial stem/progenitor cells from Etv5−/− testes have decreased proliferation in vivo at Postnatal Day 8. Data are shown as the percentage of RET-positive spermatogonia that are proliferating as determined by RET and MKI67 immunostaining in serial Postnatal Day 8 WT (n = 4) and Etv5−/− (n = 3) testis sections. Results are the mean ± SEM. *Significant difference (P < 0.05).
