Figure 3

Effects of age and strain on CD4+/CD44^med/high ( A ), CD4+/CD44^neg/low ( B ), CD8+/CD44^med/high ( C ), and CD8+/CD44^neg/low ( D ) splenocytes isolated from the spleens of male C57BL/6 and BALB/c mice up to 18 months of age. * Indicates strain differences within a particular age category (P < 0.001). ^a,b,c,d Indicates age differences within a particular strain (P < 0.05).