SMN1 and autoimmune hepatitis: At present, AIH is recognized as two types: AIH‐1, positive for anti‐nuclear (ANA) and/or anti‐smooth muscle (SMA) antibodies, and AIH‐2, positive for anti‐liver kidney microsomal antibody type 1 (anti‐LKM1), anti‐LKM3 and/or anti‐liver cytosol antibody type 1 (anti‐LC1).9, 10