Online supplemental material. Fig. S1 shows the characterization of peripheral CD8+ T cells from Runx3−/− mice. Fig. S2 shows effector protein expression by Runx3 WT and KO cells at day 4 of in vitro culture. Primer sequences used for ChIP experiments are shown in Table S1. Online supplemental material is available at http://www.jem.org/cgi/content/full/jem.20081242/DC1.