Relaxation of Pubic Symphysis of the Mouse during the Estrous Cycle and Pseudopregnancy.

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Abstract
X-ray photographs were taken of the pubic symphyses of mice at various stages of the estrous cycle and the separations of the pubic bones were measured. Significant relaxation occurred during estrus. No change in separation could be detected during artificially-induced pseudopregnancy even when the uteri were stimulated to produce deciduomata.