the influence of age and mammary gland differentiation on the incidence of tumors induced by 7,12-dimethylbenz ( a ) anthracene ( dmba ) was studied by correlating the development of the mammary glands of 20-180-day-old , virgin sprague-dawley rats with the number and type of tumors induced by dmba administered at those various ages .
C0001430
gland
C2981607
type