Microphotographs of 7-day-old mouse ovaries. (A) Section stained with hematoxylin and eosin for identification of follicle status. IHC localizations for c-kit (B), SCF (C), and inhibin-α (D) were also carried out in the serial sections. Arrowheads, preantral follicles; thick arrows, primary follicles; thin arrows, primordial follicles. SCF, stem cell factor; oe, ovarian epithelium. Bar = 100 μm.