The fibrinogen region between amino acids 414-433 is known to be autoantigenic in RA patients [6,22], but for the citrullinated fibrinopeptide A (amino acids 20-35) no data on autoantigenicity is available, most likely because it is not part of the mature fibrinogen protein that has been used in such studies most frequently. This evidence concerns the gene FGA and rheumatoid arthritis.