title: Flow cytometric analysis of erythrocytic D antigen density profile.
abstract: Red blood cells (RBC) were studied with flow cytometry (FCM) after staining with a directly fluoresceinated anti-D antiserum. The immunofluorescence distribution profiles were slightly asymmetrical, due to a significant, yet small skewness. This skewness was not associated specifically with D antigen positivity, making a homogeneous, normal D antigen distribution on the RBC very likely. With the exception of Du, D-positive RBC could always be distinguished from D-negative ones. FCM was successful in bringing the following phenomena to light: difference in mean fluorescence intensity between the different rhesus phenotypes, the D gene dosage effect, the depressing effect of C antigen on D antigenicity, the nonspecific attachment of IgG on (D-negative) RBC and rhesus mosaicism. The absolute number of D antigen sites could be calculated, using an absolute fluorescence standard.
mesh_terms: D004912:Erythrocytes / Q000276:immunology*; D005434:Flow Cytometry / Q000379:methods*; D005455:Fluorescent Antibody Technique; D006801:Humans; D007519:Isoantigens / Q000032:analysis*; D010641:Phenotype; D012204:Rh-Hr Blood-Group System / Q000235:genetics / Q000276:immunology*
chemical_list: D007519:Isoantigens; D012204:Rh-Hr Blood-Group System