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Ribbon structures showing the orientation of Gly residues and various side chains. (A) The Gly Hα3 protons, which would be replaced by a side chain Cβ atom if mutated, are displayed. (B) Side chains of Ala5, Ala7, and Trp21. Mutation of Ala5 to Val would require rearrangement of the Trp21 side chain.
