The cardiovascular exam was notable for new-onset atrial fibrillation confirmed via electrocardiogram (EKG) (Figure 1). Baseline liver function tests drawn two weeks prior to this admission were within normal limits: aspartate aminotransferase (AST) 11 U/L and alanine transaminase (ALT) 26 U/L. The gene discussed is GPT; the disease is atrial fibrillation.