title: Monoclonal antibodies against chicken Bu-1a and Bu-1b alloantigens.
abstract: The production and characterization of monoclonal antibodies (mAbs) against chicken B cell surface alloantigens, Bu-1a and Bu-1b, is described. Flow cytometric analysis using these mAbs demonstrates that Bu-1 gene locus does not show allelic exclusion. Two color fluorescence analysis using simultaneous surface marker labeling and DNA staining shows that the expression of Bu-1 antigen is not restricted to a specific phase of the cell cycle. Earlier findings that Bu-1 locus is not linked to the MHC locus are confirmed. Furthermore, data is presented that Bu-1 antigen expression is not entirely B cell restricted. Apparently a fraction of larger mononuclear cells with typical light scatter characteristics in flow cytometry also bear this marker. MAbs against both allelic Bu-1 antigens are beneficial tools e.g. in typing of chicken lines and in studies on chicken B cell differentiation.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000096:biosynthesis* / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology*; D002060:Bursa of Fabricius / Q000166:cytology / Q000276:immunology; D002453:Cell Cycle; D002454:Cell Differentiation; D002469:Cell Separation; D002645:Chickens / Q000235:genetics / Q000276:immunology*; D000939:Epitopes / Q000276:immunology; D005434:Flow Cytometry; D007519:Isoantigens / Q000235:genetics / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000939:Epitopes; D007519:Isoantigens