Abstract
Summary
Hormonal stimulation leads to early MTV activity in the mammary glands of BALB/cfC3H female mice. Whereas substantial MTV activity does not appear until 13 weeks in the intact virgin BALB/cfC3H mammary gland, 3 weeks of hormonal stimulation leads to MTV activity in mammary ducts of 6-week-old BALB/cfC3H female mice. In addition, both BALB/c normal lobules and BALB/c hyperplastic nodule outgrowths possess MTV activity after 6 weeks in a MTV-positive host, following 3 or more weeks of hormonal stimulation.
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