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Changes in the plasma P4 level and the CL weight throughout pregnancy and postpartum. P4 levels in the circulating blood plasma (A) and wet weight of the CL tissue (B) in intact rats were determined throughout pregnancy and the postpartum period. Data are presented as the mean ± SEM (n = 6, A; n = 5–7, B). Different letters in A and B indicate significant differences (P < 0.05).
