Intrinsic factor
MAMMALIAN PROTEIN FOUND IN HOMO SAPIENS
Intrinsic Factor; Intrinsic factor complex; Gastric intrinsic factor; GIF (gene)
Intrinsic factor (IF), cobalamin binding intrinsic factor, also known as gastric intrinsic factor (GIF), is a glycoprotein produced by the parietal cells (in humans) or chief cells (in rodents) of the stomach. It is necessary for the absorption of vitamin B12 later on in the distal ileum of the small intestine.