FIG. 2.

NK cell cytotoxicity in resistant and susceptible mouse strains. Popliteal lymph nodes were pooled from six animals per group from 2-day-infected (A and B) and uninfected (D) mouse strains. Splenocytes from poly(I-C) treated mice were used as positive controls (C). Effector cells were assayed for cytolytic activity against YAC-1 target cells in a 4-h Cr release assay. Similar results were obtained in three other experiments. Values are means of triplicate wells, and standard deviation were less than 10% in all samples.