4EIP:
reference: An Unusual Role for a Mobile Flavin in StaC-like Indolocarbazole Biosynthetic Enzymes., Goldman PJ, Ryan KS, Hamill MJ, Howard-Jones AR, Walsh CT, Elliott SJ, Drennan CL, Chem Biol. 2012 Jul 27;19(7):855-65. PMID: 22840773

This OCA Structure page
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