NHS-activated 2-octynoic acid-BSA is an immunogen utilized to develop a mouse model for primary biliary cholangitis (PBC). When combined with Complete Freund's Adjuvant, it stimulates the immune system to recognize it as a foreign antigen, triggering an immune response against the body's biliary epithelial cells. This results in the production of anti-PDC-E2 antibodies, causing bile duct damage and inflammation. NHS-activated 2-octynoic acid-BSA is promising for primary biliary cholangitis research.