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The αR formed by the 19-residue peptide that contains three d residues, Boc-LUVALUV-d-A-d-L-LVFVU-d-V-LFVV-OMe. Hydrogen bonds are indicated by dashed lines. The light-colored segment at the top of the diagram, containing the N17a to C20a fragment, shows the head-to-tail connection between helices that stack into continuous columns.
