title: IgG subclass deficiencies in chronic fatigue syndrome.
mesh_terms: D000328:Adult; D002908:Chronic Disease; D004406:Dysgammaglobulinemia / Q000276:immunology*; D005221:Fatigue / Q000276:immunology*; D005260:Female; D006801:Humans; D017099:IgG Deficiency; D007074:Immunoglobulin G / Q000145:classification; D008297:Male; D013577:Syndrome
chemical_list: D007074:Immunoglobulin G