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(A) Testosterone; (B) progesterone; (C) 17β-oestradiol. Gonads were incubated for 16 h with various concentrations of oct-GnRH. White bars indicate follicle and grey bars indicate spermatozoa. Each point represents the mean±S.E.M. for three preparations. *P<0.05 compared with sex steroid in the absence of oct-GnRH.
