Pregnancy-block in the meadow vole, Microtus pennsylvanicus.
D000818:Animals; D003307:Copulation; D005260:Female; D007962:Leukocytes; D008297:Male; D011247:Pregnancy; D011270:Pregnancy, Animal; D012377:Rodentia / Q000502:physiology*; D012726:Sexual Behavior, Animal; D014626:Vaginal Smears