title: Qc-1, a novel Q-region-controlled CTL determinant expressed on B lymphocytes.
abstract: Using cloned cytotoxic T lymphocytes (CTL), we have identified a Q region controlled determinant with a unique strain and tissue distribution. Several strains that express the classically defined Qa-2 determinant and other Q region controlled determinants do not express the CTL determinant. In addition, strain BALB/cByJ, which does not normally express any Q region controlled cell surface determinant, expresses this new determinant. Cross-reactivity between the Q region controlled CTL determinant and a Kk region controlled class I product (probably H-2Kk) was observed. Finally, among lymphocytes, the CTL determinant is expressed preferentially (if not exclusively) on B cells, thus distinguishing it from all previously described Q region controlled determinants, which are expressed predominantly on T cells. We provisionally designate this novel Q region controlled CTL determinant Qc-1. The possibility that Qc-1 is recognized together with a self antigen is discussed.
mesh_terms: D000818:Animals; D000954:Antigens, Surface / Q000235:genetics / Q000302:isolation & purification*; D001402:B-Lymphocytes / Q000276:immunology*; D002460:Cell Line; D003429:Cross Reactions; D000939:Epitopes / Q000235:genetics / Q000276:immunology; D005796:Genes; D006183:H-2 Antigens / Q000276:immunology; D015395:Histocompatibility Antigens Class I; D051379:Mice; D008815:Mice, Inbred Strains / Q000235:genetics / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology
chemical_list: D000954:Antigens, Surface; D000939:Epitopes; D006183:H-2 Antigens; C024755:H-2K(K) antigen; D015395:Histocompatibility Antigens Class I; C032907:Q surface antigens