TGM2 and hepatitis A virus infection: Results showed elevated ALP, parathyroid hormone (PTH), antinuclear antibody (ANA), and gamma-glutamyl transferase (GGT) (Table 1). Hepatitis serologies, anti-cyclic citrullinated peptide (anti-CCP), anti-mitochondrial antibody (AMA), and tissue transglutaminase (TTG) were negative.