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. Helix-loop-helix peptides containing 63 residues (HC4H2, HC4HC, HC5H), designated by their sequence and content of histidyl (H) and cysteinyl (C) residues, have been previously synthesized for the purpose of stabilizing certain bridged metal sites in proteins. These peptides bind one Fe4S4 cluster by means of a ferredoxin tricysteinyl consensus sequence and an additional Cys residue, and one Ni(II)...
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