Microphotographs of 21 dpp mouse ovaries. (A) For observation of follicular status, section was stained with hematoxylin and eosin. IHC localizations for c-kit (B), SCF (C), and inhibin-α (D) were also shown in the serial sections. o, oocyte; a, antrum; af, antral follicle; pa, preantral follicle. Bar = 100 μm.