Figure 8.

Effect of Y4 receptor deletion on mammary gland development in Y4^−/− and Y4^−/−,ob/ob double knockout mice. Whole mounts (5× original magnification) and corresponding hematoxylin/eosin-stained histology (insets, 100× original magnification) of the 4th inguinal mammary gland from females of the indicated genotypes, either virgins or after pairing with a fertile male (mated). Animal age is indicated in weeks (w) and reproductive state for the mated group as days of pregnancy (dp), days postpartum (pp), or nulliparous (np).