6B2V:
reference: Structural and Functional Studies of a Pyran Synthase Domain from a trans-Acyltransferase Assembly Line., Wagner DT, Zhang Z, Meoded RA, Cepeda AJ, Piel J, Keatinge-Clay AT, ACS Chem Biol. 2018 Mar 1. doi: 10.1021/acschembio.8b00049. PMID: 29481043

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