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Raman spectra of BSA and the BSA–Cu(II) complex at physiological pH. (a) Raman spectra of BSA alone and in the presence of different concentrations of Cu(II) (800–1800 cm–1). (b) Amide I (1600–1700 cm–1) region. (c,d) Amide I region of BSA alone and with the addition of 15 μM Cu(II) deconvoluted displaying an increase in antiparallel β-sheet conformation.
