2M37:
reference: The astexin-1 lasso peptides: biosynthesis, stability, and structural studies., Zimmermann M, Hegemann JD, Xie X, Marahiel MA, Chem Biol. 2013 Apr 18;20(4):558-69. doi: 10.1016/j.chembiol.2013.03.013. PMID: 23601645

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