Relative Ednra expression in tissues from pregnant or progesterone-treated mice. The qRT-PCR results were normalized with 18S rRNA. Data are displayed as fold inductions of mRNA after normalization compared with the virgin or carrier controls. For the placentas, results were compared with day 10.5 of pregnancy. A, qRT-PCR quantification of Ednra expression in C57BL/6J mice pregnant for 10.5, 15.5, and 18.5 days. B, Relative Ednra expression in the uterus of pregnant mice; same legend as in A. C, Relative expression of the gene in tissues from ovariectomized mice (ovx) treated with the carrier (c) or progesterone (p) for 12 and 24 hours. D and E, Relative Ednra expression in cultured primary myometrium (D) and kidney (E) cells treated with 2 and 4 ng/ml progesterone for up to 24 hours. For statistical analysis (ANOVA), comparisons were made with virgin controls unless otherwise indicated. #, P < .01; *, P < .05; and ^^, P < .1. Error bars represent SEs.