3SBN:
reference: Four complete turns of a curved 3(10)-helix at atomic resolution: the crystal structure of the peptaibol trichovirin I-4A in a polar environment suggests a transition to alpha-helix for membrane function., Gessmann R, Axford D, Owen RL, Bruckner H, Petratos K, Acta Crystallogr D Biol Crystallogr. 2012 Feb;68(Pt 2):109-16. Epub 2012, Jan 6. PMID: 22281739

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