This article introduces a CD-ROM containing whole-mount and histological im
ages of normal growth and development of both the mouse mammary gland and t
he human breast. It also covers nonneoplastic lesions and neoplasias in bot
h species including a catalog of lesions in genetically engineered mice. In
structions, with examples, on techniques such as whole-mount preparation, i
mmunohistochemistry, in situ hybridization, and common histological stains
are provided. The images are based on full-scale 1996 X 1640 pixel images a
t 300 pixels/inch and are annotated. Every genetically engineered model has
one or more accompanying citations. Tables are provided for orientation an
d organization. The CD includes zoom capabilities, a search engine, and a h
elp mode.