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TCN2 dimer (holo-transcobalamin) highlighting variant at amino acid position 776 (yellow)
Wire frame structures of the transcobalamin TCN2 dimer with cobalamin ligand represented in yellow at the centre of each monomer. White arrows indicate amino acid residue 776, the site of proline to arginine transition consequent to DNA sequence variant rs1801198 (C>G). Disulfide bonds are represented in orange.
