Representative images of immunofluorescent staining for STAR (steroidogenic acute regulatory protein a, b, c), CYP11A1 (cytochrome P450, family 11, subfamily A, polypeptide 1, d, e, f), and HSD3B7 (hydroxy-delta-5-steroid dehydrogenase, 3 beta- and steroid delta-isomerase 7, g, h, i) in bovine CL at control (30 min after saline), and at first and fourth biopsies from 4XPGF group. Labeled tissue sections were counterstained with 4′, 6-diamidino-2-phenylindole dilactate (blue staining). Bars = 100 μm.