Immunofluorescent detection of MMP14 and MMP16 in monkey periovulatory follicles. Monkeys received gonadotropins to stimulate the development of multiple follicles. Ovarian tissue from these animals was obtained before (0 h; A and E) or at 12 h (B and F), 24 h (C and G), or 36 h (D and H) after administration of hCG to initiate periovulatory events. Immunolocalization was performed for MMP14 (A–D) and MMP16 (E–H). All images are oriented as in A, with ovarian stroma (s) in the lower left, granulosa cells (gc) central, and follicle antrum (an) in the upper right. Insets in B and H show that faint immunofluorescence was present when the primary antibody was omitted. Bar = 50 μm.