Proteomics analysis of RA NETs identified citrullinated forms of known auto-antibody targets, such as cit-α-enolase, cit-histone H2A, cit-histone H4, cit-vimentin (128), as well as acetylated and methylated histones in line with analysis of NET debris in RA serum (118). Here, CIT is linked to rheumatoid arthritis.