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Zn(II) K-edge XANES spectra of Zn(II) bound to Aβ (black line) and to N mutants (panel A) and O mutants (panel B), Hepes buffer 50 mM pH 6.9, [Zn(II)] = 1.0 mM, [peptide] = 1.1 mM, T = 20 K. Normalization of the amplitude is given for the reference Zn(Aβ) complex.
