title: Heterogeneity of hypogammaglobulinemia.
mesh_terms: D000361:Agammaglobulinemia / Q000235:genetics* / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology; D004062:DiGeorge Syndrome / Q000235:genetics; D004406:Dysgammaglobulinemia / Q000235:genetics; D014644:Genetic Variation; D006801:Humans; D017098:IgA Deficiency; D007075:Immunoglobulin M / Q000172:deficiency; D010641:Phenotype; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D007075:Immunoglobulin M