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Separation and isolation of rat natural killer (NK) cells from T cells with monoclonal antibodies.

It has been difficult to clearly differentiate rat NK cells from cytotoxic T cells. In this study we have shown that rat NK cells do not express the T cell protein defined by the OX 19 antibody. By using the FACS we have isolated the OX 19- OX 8+ lymphocyte subset that contains virtually all the NK activity. The simultaneous use of the OX 19 and OX 8 antibodies allows the separation of NK cells from T cells.