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Figure 7-1: Development of T Cell Subsets. In the thymus, undifferentiated precursors give rise to CD4+ and CD8+ cells. In the peripheral lymphoid tissues CD4+ cells (CHO) differentiate following activation by exposure to cognate antigen into two subsets (TH1 and TH2), which are well characterized in the mouse, less so in man. Development of these cells is to some extent reciprocally controlled by cytokines, and the cytokines secreted are also distinct. CD8+ cells similarly mature after antigenic stimulation into less well defined subsets. or = effect on subset proliferation. = cytokines produced.