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High resolution XPS spectra: (a) N1s spectra of Alg-PAm (black), Alg-PAm-RGD (red) and Alg-PAm-TYRAY (blue). The immobilization of the peptides leads to the rise of the amide signals at 399.9 eV and the protonated guanidinium group of arginine at 401.7 eV; (b) Representative high-resolution Cu 2p spectrum lacks peaks arising from Cu2+ cations.
