Plasma cells in bone marrow.
D000361:Agammaglobulinemia / Q000175:diagnosis; D000917:Antibody Formation; D001853:Bone Marrow; D001854:Bone Marrow Cells; D001856:Bone Marrow Examination; D002648:Child; D006801:Humans; D007109:Immunity; D007153:Immunologic Deficiency Syndromes / Q000175:diagnosis; D007231:Infant, Newborn; D010950:Plasma Cells