Hexa-His TFA is a peptide consisting of 6 His residues, used as a metal binding site for the recombinant protein[1].
[1]. Watly J, et al. Insight into the coordination and the binding sites of Cu(2+) by the histidyl-6-tag using experimental and computational tools. Inorg Chem. 2014 Jul 7;53(13):6675-83.
















