4M6A:
reference: N-terminal beta-strand swapping in a consensus-derived alternative scaffold driven by stabilizing hydrophobic interactions., Luo J, Teplyakov A, Obmolova G, Malia TJ, Chan W, Jacobs SA, O'Neil KT, Gilliland GL, Proteins. 2014 Jan 27. doi: 10.1002/prot.24517. PMID: 24464739

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