Citrin
Citrin also known as solute carrier family 25, member 13 (citrin) or SLC25A13 is a protein which in humans is encoded by the "SLC25A13" gene. Citrin is associated with type II citrullinemia and neonatal intrahepatic cholestasis caused by citrin deficiency (NICCD). The term Citrin when referring to Vitamin-P was the most active Bio-flavonoid in lemons, it was found to be Eriodictyol (but a more active form constituent was found there decades later).