5T81:
reference: Structural elements of an NRPS cyclization domain and its intermodule docking domain., Dowling DP, Kung Y, Croft AK, Taghizadeh K, Kelly WL, Walsh CT, Drennan CL, Proc Natl Acad Sci U S A. 2016 Nov 1;113(44):12432-12437. Epub 2016 Oct 17. PMID: 27791103

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