Figure 6. Preparations of mice ovaries with ZP2 marker Immunohistochemical (CPI) staining. Ovaries that were positive (A) and negative (B) for CPI staining with a ZP2 marker, 40× magnification, 100 μm scale bar and primary (C), secondary (D), and tertiary (E and F) follicles that were positive for CPI staining with a ZP2 marker, 400× magnification, 25 μm scale bar.