Differentiation of murine TH cells virgin short term chronic long term TH cells stimulation stimulation memory THP THO THM TH2 cytokines released THP THO TH1 TH2 THM IFN IFN. L-2 IL-2 I儿-2 IL-2 IL-4 IL-4 IL-5 L-5 IL-6 L-10 L-10