Fig. 4.
Proliferative responses of thymocytes from Jak3+/+ mice (+/+), control-treated Jak3−/− mice (−/−), and IL-3–treated Jak3−/− littermates (−/− IL-3). Jak3−/− thymocytes do not respond to T-cell mitogenic and Jak3-dependent cytokine stimuli. Thymocytes were stimulated with mitogen/cytokine combinations as described in Materials and Methods, and their proliferation was measured by incorporation of [3H]-thymidine. Values are average stimulation indices ± SD (n = 2 in each group).