Intrinsic factor (IF), also known as gastric intrinsic factor (GIF), is a glycoprotein produced by the parietal cells of the stomach.It is necessary for the absorption of vitamin B12 (cobalamin) later on in the small intestine. In humans, the gastric intrinsic factor protein is encoded by the GIF gene.Haptocorrin (also known as HC, R protein, and transcobalamin I, TCN1), is a glycoprotein secreted by the salivary glands which binds to vitamin B 12.he intrinsic factor is secreted by the stomach. It is present in the gastric juice as well as in the gastric mucous membrane. The optimum pH for its action is 7 and it is inactivated at temperatures above 45 Â°C.
The snow leopard or ounce (Panthera uncia syn. Uncia uncia) is a large cat native to the mountain ranges of Central and South Asia. It is listed as Endangered on the IUCN Red List of Threatened Species because, as of 2003, the size of the global wild population was estimated at 4,080â6,590 adults.
Panthera is a genus within the Felidae family that was named and first described by the German naturalist Oken in 1816. The British taxonomist Pocock revised the classification of this genus in 1916 as comprising the species tiger, lion, jaguar and leopard on the basis of cranial features.Results of genetic analysis indicate that the snow leopard also belongs to the Panthera, a classification that was accepted by IUCN assessors in 2008.Only the tiger, lion, leopard and jaguar have the anatomical structure that enables them to roar.esults of genetic analysis indicate that the snow leopard also belongs to the Panthera, a classification that was accepted by IUCN assessors in 2008. Only the tiger, lion, leopard and jaguar have the anatomical structure that enables them to roar.