Fig. 7. UVRR spectra of Hst-5 in the absence of added metals (A, black) and after the addition of Zn²⁺ (B, green), Cu²⁺ (C, blue), or a mixture of Zn²⁺ and Cu²⁺ (D, pink). Reprinted with permission from McCastlin et al.¹⁰³ Copyright 2019 Springer Nature.