5D9E:
reference: The ring residue proline 8 is crucial for the thermal stability of the lasso peptide caulosegnin II., Hegemann JD, Fage CD, Zhu S, Harms K, Di Leva FS, Novellino E, Marinelli L, Marahiel MA, Mol Biosyst. 2016 Feb 11. PMID: 26863937

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