CD6 and primary biliary cholangitis: In order to investigate the expression of CD6 in various inflammatory liver diseases, immunohistochemistry was performed on liver biopsies from individuals with autoimmune hepatitis (AIH, n=61), primary biliary cholangitis (PBC, n=10), non-alcoholic liver disease (NAFLD, n=8), chronic hepatitis B (CHB, n=17) and healthy controls (n=4).