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Effect of TNF-α on expression of AKR1B1 protein in the fetal membranes and the associated changes in PGF2α production from fetal side of membranes. C, control; M, maternal side exposure; F, fetal side exposure; and M&F, maternal and fetal sides exposure. TNIL, term not in labor; STL, spontaneous term labor; SPL, spontaneous preterm labor. The bars represent the mean ± SD; n = 4, *p < 0.05.
