| 4FYX: reference: Metal Ion Involvement in the Allosteric Mechanism of Escherichia coli Aspartate Transcarbamoylase., Cockrell GM, Kantrowitz ER, Biochemistry. 2012 Sep 11;51(36):7128-37. Epub 2012 Aug 24. PMID: 22906065 |
This OCA 
Structure page
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(documentation).