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Correlations among antibodies to CCP, CAP, and ribosomal P peptide by ELISA. A. RA sera (n = 47) were tested for anti-CCP versus anti-CAP. B. Anti-CCP versus anti-CAP in SLE sera (329 Americans, 6 Japanese). C. Anti-CCP versus anti-CAP in SLE cases with deforming/destructive arthropathy (subset I: 20 Americans, 6 Japanese). D. Anti-CCP versus anti-ribosomal P peptide antibodies in SLE sera (n = 329 Americans).
