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PTHrP up-regulates the expression levels of some Leydig cell-specific proteins in vitro. The protein levels of CYP11A1, CYP17A1, 17β-HSD3, 11β-HSD1, and STAR were analyzed by Western blot in the seminiferous tubules treated with 0, 10, 100, and 1,000 pg/ml PTHrP for 14 days. Mean ± SEM, n = 3, *P < 0.05, **P < 0.01 when compared to the control.
