Splenocytes from C57BL/6 (CD45.1+) mice were used to isolate donor NK cells. NK cells were enriched by using the mouse NK Cell Isolation Kit II (Miltenyi Biotec) and activated in vitro for 5 days with 5.000 U/mL IL-2 (Chiron) before intravenous (IV) infusion into C57BL/6 (CD45.2+) recipient mice.
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