1UEK:
reference: Crystal structure of 4-(cytidine 5'-diphospho)-2-C-methyl-D-erythritol kinase, an enzyme in the non-mevalonate pathway of isoprenoid synthesis., Wada T, Kuzuyama T, Satoh S, Kuramitsu S, Yokoyama S, Unzai S, Tame JR, Park SY, J Biol Chem 2003 Aug 8;278(32):30022-7. PMID: 12771135

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