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Effects of LH and/or OP on P4 production. The cells were treated with LH (10 ng/ml) alone or in combination with OP (100 μM) for 24 h. All values are expressed as a percentage of the control and represent the mean ± SEM of four separate experiments each performed in duplicate. The mean P4 concentration in the control was 709.7 ± 32.8 ng/ml. Different letters indicate significant differences (P<0.05), as determined by ANOVA followed by Fisher's PLSD as a multiple comparison test.
