the whole second thoracic mammary gland of estradiol-17beta + progesterone primed 3- to 4-week-old balb/c female mice was induced to pregnancy-like lobulo-alveolar morphogenesis after 6-day cultivation in a serum-free culture medium containing a `` '' growth promoting '' '' hormone mixture , insulin + prolactin + growth hormone ( somatotropin ) + estradiol + progesterone .
C0014912
estradiol-17beta
C0032961
pregnancy