CR2 and rheumatoid arthritis: The overlapping interacting proteins of ITIH4 were ALB, TG, HSPA1B, PGK1, ACTBL2, ACTG1, VTN, FN1, CXCR4, CXCR5, CCR5, CCL4, SDC3, SCD5, CR2, CD8A, CD4, and CD209, which were found to have a link with RA.