SMN1 and autoimmune hepatitis: Compared to other forms of autoimmune liver disease (AILD), AIH is characterized by a hepatocellular pattern of elevated levels of liver enzymes, positive tests for non-disease-specific antinuclear antibodies (ANA) and/or smooth muscle antibodies (SMA), which are the histological hallmark of AIH interface hepatitis on liver biopsy, and an optimal response to steroids in most patients [9–11].