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With anti-Ly antisera and complement it has been possible to demonstrate that cytotoxic effector cells generated in vitro against allogeneic cells carry the alloantigen Ly-5 and Ly-6. The studies show that antisera directed against the Ly-6 antigens, together with complement, eliminate essentially all of the killer cells, of the appropriate strain, while killing only 50 to 60% of Thy-1+ cells. Anti-Ly-5 antsera and complement lysed 55 to 65% of Thy-1+ cells and killed a significant portion, but not all, of the cytotoxic cells. The later finding was investigated in more detail since it suggested a degree of heterogeneity within the killer cell subpopulation. However, the data did not support that conclusion, at least for allogeneic killer cells.


Journal article


J Immunol

Publication Date





1739 - 1743


Animals, Antilymphocyte Serum, Cell Separation, Cytotoxicity Tests, Immunologic, Immunity, Cellular, Immunosorbent Techniques, In Vitro Techniques, Isoantigens, Lymphocytes, Mice, Mice, Inbred Strains, Phenotype, Species Specificity, T-Lymphocytes