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Reddehase, M. and Suessmuth, W. and Moyers, C. and Falk, Werner and Droege, W. (1982) Interleukin 2 is not sufficient as helper component for the activation of cytotoxic T lymphocytes but synergizes with a late helper effect that is provided by irradiated I-region-incompatible stimulator cells. Journal of immunology (Baltimore, Md. : 1950) 128 (1), pp. 61-68.