Fig. 1.

The mammary gland is larger and more developed in CRL adult males. a Representative whole mount mammary glands from F2 and CRL males. Scale bar = 1 mm. b Quantification of two parameters of the male mammary gland, ductal area (left) and number of branching points (right) reveals significant differences between F2 and CRL males. For both graphs, * indicates p ≤ 0.01. c Linear regression analyses reveal strong associations between the number of branching points and ductal area in both F2 and CRL males, but CRL males had more branching points per square millimeter of ductal area than F2 males