Figure 1.

Historical timeline of the mouse mammary tumor biologist. A timeline of the first observation in rodent breast pathology and the development of transgenic mouse to today. (Image of CC Little courtesy of The Jackson Laboratory [http://www.jax.org/milestones/researchhighlights.htm]; image of GB Pierce reproduced from Schwartzendruber 1993 with permission from The International Journal of Developmental Biology © 1993; and image of TA Stewart reproduced from Hanahan et al. 2007 with permission from Cold Spring Harbor Laboratory Press © 2007.)