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Replacement of a single residue in a β-hairpin by Gly-Pro, a 'united-residue' known to be overrepresented in protein β-sheets as Gly-cisPro without causing much structural distortion, and comparison of the resulting β-hairpin with those of other single/double residue substitutions show that Gly-Pro but not Pro-Gly is well accommodated in the isolated β-hairpin.We have studied, using DFT calculations, some geometrical and electronic properties of delaminated pyrophyllite (D-P) and the corresponding layers that result from three isomorphic