Regarding the liver function tests, GN patients and healthy subjects had a normal level of alanine transaminase (mean ALT values 22.4 IU/L vs. 19.6 IU/L in GN and healthy controls, respectively), aspartate transaminase (AST mean 27.8 IU/L vs. 23.3 IU/L in GN and healthy controls, respectively), and bilirubin levels (mean total bilirubin values 0.72 mg/dL vs. 0.61 mg/dL in GN and healthy controls, respectively). The gene discussed is GPT; the disease is ganglioneuroma.