Ccl2/CCL2 in gestational tissues. Relative mRNA expression and concentration of Ccl2/CCL2 in uterus (A and D), fetal membranes (B and E) and placenta (C and F). Data are presented as mean ± SEM of determinations in duplicate per group of tissues (n=5 each). Means with different letters are significantly different. P values (a vs. b) : A) p=0.04; B) p=0.022; C) p= 0.008; F) p=0.040.