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CD difference spectra of the (a) Hka/TetraHPRG/ Cu2+ ternary system minus CD spectra from TetraHPRG/Cu2+ systems and CD spectra of the Hka/ Cu2+ at 1:1 metal to ligand ratios and (b) CD difference spectra of the Hka/TetraHPRG/Zn2+ ternary system minus normalized CD spectra from TetraHPRG/Zn2+ systems and CD spectra of the Hka/Zn2+ at 1:1 metal to ligand ratios.
