column chromatography of uterine washings and placental extracts from pregnant rabbits and thymus extracts from estrous rabbits showed most of the isotope associated with moieties greater than or equal to 200,000 mw whereas the isotope in `` '' milk '' '' and extracts of mammary tissue was bound to components of 25,000-35,000 mw .
C0032048
placental extracts
C0040291
extrac