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 .
C0040112
thymus
C0040291
extrac