Fig. 6.
Characterization of DN tumor precursor cells in ThPOKconst mice. (A) FACS analysis of gated TCR− DN (CD4−CD8−) thymocytes from 5-wk-old ThPOKconst mice and WT littermates. Note the relative increase in the DN4 (CD44−CD25−) fraction in all ThPOKconst mice, and the appearance of CD44INT cells, which also express variable levels of CD25, in a subset of ThPOKconst animals (Bottom row; CD44INT population is outlined in red). (B) A total of 25–100 × 103 sorted DN thymocytes from indicated mice were transferred into sublethally irradiated Rag2−/− recipient mice, and PBLs were analyzed by FACS for CD4 and CD8 expression at indicated times.