mice exposed to estrogens as neonates developed more mammary dysplasias and had different morphologic types of dysplasias than did normal animals when both groups were exposed to a carcinogen : 1 ) before puberty , 2 ) during active mammary growth , 3 ) or at 6 months of age ( the time when spontaneous dysplasias begin to appear in normal animals ) .
C0016034
mammary dysplasias
C0006141
mammary