5EXI:
reference: Crystallographic snapshots of sulfur insertion by lipoyl synthase., McLaughlin MI, Lanz ND, Goldman PJ, Lee KH, Booker SJ, Drennan CL, Proc Natl Acad Sci U S A. 2016 Aug 23;113(34):9446-50. doi:, 10.1073/pnas.1602486113. Epub 2016 Aug 9. PMID: 27506792

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