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Concentrations of IgG antibodies to heat shock protein (HSP) 90 in patients with recent onset RA, longstanding RA, psoriatic arthritis, ankylosing spondylitis, mixed connective tissue disease (MCTD), systemic lupus erythematosus (SLE), primary Sjögren's syndrome (SS), progressive systemic sclerosis (PSS), and normal controls (C). The upper limit of normal is indicated by a broken line.
