IGHJ5 and rheumatoid arthritis: The proportions of IGHJ5, IGHV1-NL1 and IGHV4-30-4 were higher in RA group than in HC group, while the proportions of IGHV1-18, IGHV3-9, IGHV1-69, IGHV5-51, IGHV1-8 and IGHV3-41 were lower in RA group than in HC group.