Cyclic Citrullinated Peptide Antibody

**Semantic type:** Amino Acid, Peptide, or Protein|Immunologic Factor

**Definition:** An autoantibody directed against peptides or proteins whose arginine residues have been enzymatically converted to citrulline. It is often associated with rheumatoid arthritis.

**Synonyms:** - ACPA - ACPA - Anti-Keratin Antibody - Anti-Keratin Antibody - Anti-Perinuclear Factor Antibody - Anti-Perinuclear Factor Antibody - CCP - CCP