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Chemical representation of the two peptides. (a) AGKT (375 Da) and (b) GGG SGA GKT (692 Da). The peptides are constructs based on the amino acid configuration described by Bianchi et al. [28]. The peptide amine (N–H) backbone groups form a ‘nest’ structure toward phosphate anions and the Lysine side chain participates in the binding when phosphorous compounds are present. Color code: green = C, blue = N, red = O, and white = H.
