ANA: Antinuclear Antibody; Anti-CCP: Anti-Cyclic Citrullinated Peptide; RNP Ab: Ribonucleoprotein Antibody; RF: Rheumatoid Factor; dsDNA Ab: Double-Stranded DNA Antibody; SS-A/SS-B Ab: Sjögren’s Syndrome-Related Antibodies A/B; Sm Ab: Smith Antibody;  ANCA: Anti-Neutrophil Cytoplasmic Antibody; Ferritin: Ferritin (Acute Phase Reactant); CRP: C-Reactive Protein; LDH: Lactate Dehydrogenase; ACE: Angiotensin-Converting Enzyme; Anti-MPO Ab: Anti-Myeloperoxidase Antibody; Anti-PR3 Ab: Anti-Proteinase 3 Antibody. The gene discussed is CRP; the disease is Sjogren syndrome.