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Steroid hormone levels in mice tested by HPLC-MS/MS. YSCT: pregnenolone; PZP: pregnancy zone protein; E1: estrone; E2: estradiol; E3: estriol (P < 0.01 vs. POF + saline-treated mice, t-test, n = 4; P < 0.01 vs POF + saline-treated mice, t-test, n = 4).
