Earlier two transferrin receptors in humans, transferrin receptor 1 and transferrin receptor 2 had been characterized and until recently cellular iron uptake was believed to occur chiefly via these two well documented transferrin receptors. Both these receptors are transmembrane glycoproteins.
In the past, two types of transferrin receptors in humans, namely transferrin receptor 1 and transferrin receptor 2, had been studied and until recently it was believed that cellular iron absorption primarily occurred via these two well-characterized transferrin receptors. Both of these receptors are transmembrane glycoproteins.