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Representative immunoblots from the cervix of a pregnant PRB−/− mouse on days 15, 16, 17, and 18 postbreeding. With PR-B absent (no band at 116 kDa), only PR-A optical density was normalized to GAPDH (mean ± SE; n = 3/group, P > .05; 1-way ANOVA). PR indicates progesterone receptor; SE, indicates standard error; ANOVA, analysis of variance.
