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NK cell recognition of vaccinia virus-infected cells involves all three NCR. NK cells were preincubated with either MAb to CD56 (filled symbols) or the indicated MAb, or combinations of MAbs, specific for NCR (open symbols) for 30 min before addition to the mock-infected (⋄) or infected (□) targets. The data are representative of 12 experiments done with polyclonal NK lines generated from multiple donors. The error bars indicate standard deviations.
