Uteroferrin, a purple-colored, iron-containing phosphatase which is induced by progesterone in the porcine uterus, has been proposed to be an intermediary in iron transfer between the mother and conceptus in the pig. Along with a number of other uterine proteins of maternal origin, it accumulates in the allantoic fluid during mid-pregnancy. When [59Fe]uteroferrin was introduced into the allanto...
