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Angiogenesis of uterus in pregnant mice. There are two uteruses near bladder in mice. Angiogenesis of uterus rarely occurs before pregnancy (day 0). Upon pregnancy, angiogenesis of uterus springs up and uterus comes into prereceptive stage (day 1-3). Along with angiogenesis, uterus becomes receptive (day 4) from prereceptive stage.
