Microphotographs of 7-day-old mouse ovaries. (A) Ovarian slice was stained with hematoxylin and eosin to identify follicular status. Serial sections were IHC localized for c-kit (B), SCF (C), and inhibin-α (D). SCF, stem cell factor; pa, preantral follicle; o, oocyte; oe, ovarian epithelium. Thick and thin arrows are primary and primordial follicles, respectively. Bar = 50 μm.