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Effect of testosterone (T) on rat serum S1P levels. A: Serum S1P levels were detected by high‐performance liquid chromatography (HPLC). The green curve is serum sample, while the blue one is serum sample mixed with 2.6 ng exogenous S1P. B: bar graph of the average serum S1P from all experimental groups. Values are expressed as means ± S.E. *P < 0.05 versus sham or castration + T. (n = number of samples from different animals).
