Activation of individual CD4+ T cells results in differential lymphokine expression : interleukin 2 ( IL-2 ) is preferentially produced by T helper type 1 ( TH1 ) cells , which are involved in cell-mediated immune responses , whereas IL-4 is synthesized by TH2 cells , which are essential for humoral immunity .
activation of individual cd4+ t cells results in differential lymphokine expression : interleukin 2 ( il-2 ) is preferentially produced by t helper type 1 ( th1 ) cells , which are involved in cell-mediated immune responses , whereas il-4 is synthesized by th2 cells , which are essential for humoral immunity .
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