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The levels of anti-Hsp40 antibodies (IgG) in sera of rheumatoid arthritis (RA) patients (n = 48) and age-matched healthy controls (n = 50), assayed by ELISA test. The E. coli DnaJ (a) and human Hdj1 (b), Hdj2 (c) and Hdj3 (d) proteins or N-terminal J domains of DnaJ (N-DnaJ) (e) and Hdj2 (N-Hdj2) (f), and the C-terminal domains of DnaJ (C-DnaJ) (g) and Hdj2 (C-Hdj2) (h) were used as antigens. The results are presented as mean values (±SD). *P ≤ 0.05; **P ≤ 0.01; ***P ≤ 0.001
