The long-range side-chain repulsion between the (1R,2R,3R,5R)-2-amino-6,6-dimethyl-bicyclo[3.1.1]-heptane-3-carboxylic acid (trans-ABHC) residues stabilize the H12 helix in beta-peptide oligomers.
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Hetényi et al. (2008) studied this question.
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