FIG. 3.

Increased apoptosis at the corticomedullary junction in thymi from SCL LMO1 transgenic mice. Hematoxylin-eosin-stained sections from nontransgenic (A) and double-transgenic (C) mouse thymus are shown. Serial sections from nontransgenic (B) and double-transgenic (D) mice were stained for apoptotic cells. M, medulla; Cx, cortex. Apoptotic cells are indicated with arrows in panels B and D, and an arrowhead in panel C demonstrates several small, pyknotic cells at the corticomedullary junction. An increased number of apoptotic cells outlining the medulla is seen in panel D.