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An epithelial plaque in a 3.5-year-old cynomolgus monkey. (A) Low-magnification photomicrograph demonstrating the surface orientation and concurrent endometrial glandular features of the luteal phase. (B) Higher magnification. H&E. (C) Immunohistochemistry for cleaved caspase 3, indicating apoptosis, in a regressing plaque. Vector red chromogen; hematoxylin counterstain.
