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Representative immunoblot of cervix protein extract from pregnant mice on postbreeding days 15 to 18 and the day of birth (PP). Histograms are the optical density of the PR-A-to-PR-B ratio or optical density of the PR-A band normalized to the GAPDH loading control. Data are the mean ± SE (n = 4/group, P > .05; 1-way ANOVA). See Methods for details. PR indicates progesterone receptor; SE, standard error; ANOVA, analysis of variance.
