title: [Blocking factors in human blood which inhibit the cytotoxicity of lymphocytes].
abstract: The cytotoxicity of human peripheral blood lymphocytes against malignant tumor cell lines was significantly inhibited by human plasma or sera. In addition to so-called blocking factors such as antigens, antibodies, antigen-antibody complexes, IAP and ferritin, some substances which could be removed by heat or centrifugation were considered to play a significant role.
mesh_terms: D000920:Antibody-Dependent Cell Cytotoxicity; D001943:Breast Neoplasms / Q000276:immunology; D002460:Cell Line; D003110:Colonic Neoplasms / Q000276:immunology; D005260:Female; D006801:Humans; D007106:Immune Sera / Q000276:immunology; D007694:Killer Cells, Natural / Q000276:immunology*; D008214:Lymphocytes / Q000276:immunology*
chemical_list: D007106:Immune Sera