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Donor-derived spermatogenesis is shown by eGFP expression in the germ cells of the seminiferous tubules of transplanted C57BL/6 J mice transplanted with eGFP positive GS cells. (a) In this representative image, both endogenous and transplantation eGFP-derived (brown) spermatogenesis can be recognized. (b) Spermatogenic cells are positive for eGFP, while endogenous Sertoli cells are negative. Bar represents 500 μM (a) and 50 μM (b).
