- Resistance in murine schistosomiasis is contingent on activated IL-2 receptor-bearing L3T4+ lymphocytes, negatively regulated by Lyt-2+ cells, and uninfluenced by the presence of IL-4. Phillips, S.M., Lin, J.J., Galal, N., Tung, A.S., Linette, G.P., Perrin, P.J. J. Immunol. (1991)