ING4 and psoriatic arthritis: Using protein array technology, we found antibodies binding to p29ING4, which we further characterized using ELISA.<h4>Methods</h4>Thirty-six sera of early-stage type 1 CRPS, 66 sera of rheumatoid arthritis (RA), 53 sera of axial spondyloarthritis (axSpA), 29 sera of psoriatic arthritis (PsA), 22 sera of patients after radial fractures (trauma control), and 100 sera of blood donors (BD) were analyzed for anti-p29ING4.