Fig. 4.
Reduced positive selection in mice with low p38 MAPK activity.
(Panel A) Expression of CD69 in total thymocytes from NLC mice and lck-MKK3(A)/MKK6(A) transgenic mice. The percentage represents the fraction of CD69+ thymocytes from NLC and line-2 transgenic mice. The average number of CD69+thymocytes from 6 NLC mice and 6 transgenic mice with extensive p38 suppression is indicated. (Panel B) TCR, CD5, CD69, and CD28 expression on CD4+CD8− and CD4−CD8+ thymocytes from NLC mice (open curve) and line-2 transgenic mice (filled curve).