Abstract
Reconstitution of heavily irradiated rats (750 rad whole-body irradiation) with mesenteric lymph node cells from immune donors and bone marrow cells from either immune or normal (non-immune) donors caused the expulsion of transplanted damaged worms of Nippostrongylus brasiliensis. These results show that a third component derived from bone marrow is required for worm expulsion and is additional to the humoral (worm damage by antibody) and cell-mediated components previously defined by the studies of Jones and Ogilvie [1971], Kelly and Dineen [1972a], Keller and Keist [1972] and Dineen et al. [1973b].

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