spleen cells from dba/2 mice with dormant friend leukemia virus ( flv ) infections or from mice immunized with x-irradiated flc-745 erythroleukemic cells are not cytolytic for flc-745 cells when tested directly , but acquire cytolytic activity in vitro by cultivation with x-irradiated flc-745 cells .
C1536403
cytolytic
C0007634
cells