3DH7:
reference: Crystal structure of type 2 isopentenyl diphosphate isomerase from Thermus thermophilus in complex with inorganic pyrophosphate., de Ruyck J, Pouyez J, Rothman SC, Poulter D, Wouters J, Biochemistry. 2008 Sep 2;47(35):9051-3. Epub 2008 Aug 12. PMID: 18693754

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