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Lysis of YAC-1 targets by splenocytes from athymic nude mice. NK activity was measured on days 1, 2, and 3 p.i. by using spleen cells from mice infected with 106 PFU of VV-HA-Mig, VV-HA–Crg-2, or VV-HA-TK. Spleen cells from uninfected mice were used as controls. Data shown are means of lysis values from four individual mice for each group. SEMs were less than 5% and have been omitted for clarity.
