The intrinsic factor is a 45 kilodalton kDa protein which is relatively specialized and resistant to acid. It is produced by exocytosis in the parietal cell and attaches itself to Vitamin B12, allowing the vitamins later absorption in the small intestine.
El factor intrínsico en una proteína de 45 KDa relativamente especializada y resistente al ácido producida por exocitosis en la célula parietal y que se fija a la vitamina B12 para permitir su posterior absorción en intestino delgado.