TFRC also known as transferrin receptor protein 1. TFRC is required for iron delivery from transferring to cells. This protein is a transmembrane glycoprotein composed of two disulfide-linked monomers joined by two disulfide bonds. Each monomer binds one holo-transferrin molecule creating an iron-Tf-TfR complex which enters the cell by endocytosis. Recombinant human TFRC protein, fused to His-tag at N-terminus, was expressed in E.coli.