| 1UJC: reference: Crystal structure of the protein histidine phosphatase SixA in the multistep His-Asp phosphorelay., Hamada K, Kato M, Shimizu T, Ihara K, Mizuno T, Hakoshima T, Genes Cells. 2005 Jan;10(1):1-11. PMID: 15670209 |
This OCA 
Structure page
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(documentation).