| 2WQD: reference: Crystal structure of enzyme I of the phosphoenolpyruvate:Sugar phosphotransferase system in the dephosphorylated state., Oberholzer AE, Schneider P, Siebold C, Baumann U, Erni B, J Biol Chem. 2009 Sep 28. PMID: 19801641 |
This OCA 
Structure page
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(documentation).