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Evaluation of the abilities of single point charged-to-alanine Fe2hTF mutants to bind to the sTFR. All mutant hTF samples were prepared at a concentration of 20 μg/mL and competed with biotinylated Fe2hTF for binding to immobilized sTFR. All values are expressed as % of control (Fe2hTF) binding and are averages of at least three different experiments ± standard deviation.
