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Dose-dependent response of T cells to IL-2. PA cells show a strong proliferative response to IL-2. This response is dependent upon IL-2 concentration. Again, PA T cells show almost no proliferation after restimulation with anti-CD3. Compared with PA T cells, US cells proliferate strongly after exposure to anti-CD3 but respond only weakly to IL-2 (*P < 0·05). □, US; ▴, PA.
