choline essential nutrient molecule. atoms are represented as spheres with conventional color coding: hydrogen (white), carbon (

choline cholin nutrient vitamin quaternary ammonium neurotransmitter bilineurine bilineurin neurine neurin supplement diet food liver fish odor syndrome deficiency nutritional alt pregnancy neural tube memory lecithin smart nootropic hydrogen oxygen nitrogen carbon alanine transaminase molecule atoms atomic model molecular compound composition chemical chemistry bond structure formula