IFNG and rheumatoid arthritis: Proteins such as interferon-γ (IFN-γ)87, tumor necrosis factor-alpha (TNF-α)88, anti-cyclic citrullinated peptide antibody (anti-CCP)89, and eosinophilic cationic protein (ECP)90 are biomarkers of inflammatory diseases such as autoimmune hepatitis, rheumatoid arthritis (RA), and allergic rhinitis (AR) and are used for diagnosis.