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Progesterone production by granulosa cells of the largest and third largest preovulatory follicles cultured with various physiological substances for 48 h in monolayer system. cVIP, chicken vasoactive intestinal peptide; AVT, arginine vasotocin; MT, mesotocin testosterone; T, testosterone; E2, estradiol-17β; E, epinephrine; NE, norepinephrine; PGE1, prostaglandin E1; PGF2α, prostaglandin F2α.
