| http://www.w3.org/ns/prov#value | - C-lobe and an N-lobe which are nearly identical in structure.[20] Each lobe contains aspartic acid, histidine, 2 tyrosine residues and a bicarbonate ion that acts as a bidentate ligand to allow iron or other metals to bind to transferrin in a distorted octahedral geometry.[19][21][20
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