title: Are most "null" cells B cells?
mesh_terms: D000361:Agammaglobulinemia / Q000235:genetics / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology*; D002648:Child; D002675:Child, Preschool; D008040:Genetic Linkage; D006801:Humans; D007223:Infant; D008297:Male; D011947:Receptors, Antigen, B-Cell / Q000032:analysis / Q000276:immunology*; D012397:Rosette Formation
chemical_list: D011947:Receptors, Antigen, B-Cell