SLC25A13 and neonatal intrahepatic cholestasis due to citrin deficiency: There are recognized two age-dependent disease phenotypes—neonatal intrahepatic cholestasis (NiCCD, OMIM 605814) in newborns and the adult-onset type 2 citrullinaemia (CTLN2, OMIM 603471) with an onset at the age of 11–79.