title: Rheumatoid factor: Dr. Jekyll or Mr. Hyde?
authors.affiliation: Allergy and Immunology Section, University of Pennsylvania School of Medicine, Philadelphia 19104.
authors.forename: A I
authors.initials: AI
authors.lastname: Levinson
authors.forename: J
authors.initials: J
authors.lastname: Martin
mesh_terms: D000818:Animals; D006801:Humans; D012217:Rheumatoid Factor / Q000276:immunology* / Q000502:physiology
chemical_list: D012217:Rheumatoid Factor