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Sketch of the reference structural units used in multishell multiple scattering analysis. The values of distances and angles of amino acid residues were taken from (55). The Glu residue has the same structure as the Asp residue, provided Cγ and Cβ of Asp are replaced by Cδ and Cγ, respectively, of Glu. The structure of the Gln residue coincides with that of the Asn residue when Nδ2, Cγ, and Cβ of Asn are replaced by Nɛ2, Cδ, and Cγ, respectively, of Gln.
