Citrullination is a term that is commonly used in the field of immunology to describe the process of converting an arginine residue to a citrulline residue in a protein. However, there are several other words that can be used in place of citrullination. These include deimination, carbamylation, and nitrosylation. Deimination is the process of converting an arginine residue to a different amino acid called citrulline. Carbamylation, on the other hand, is the reaction of cyanate with a protein, resulting in the incorporation of carbamyl groups. Finally, nitrosylation is the addition of a nitric oxide group to a protein, often leading to changes in protein function and activity.