1XX4:
reference: Domain swapping in the low-similarity isomerase/hydratase superfamily: The crystal structure of rat mitochondrial {Delta}3, {Delta}2-enoyl-CoA isomerase., Hubbard PA, Yu W, Schulz H, Kim JJ, Protein Sci 2005 Jun;14(6):1545-55. Epub 2005 May 9. PMID: 15883186

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