| 3ADC: reference: Structural basis for the major role of O-phosphoseryl-tRNA kinase in the UGA-specific encoding of selenocysteine., Chiba S, Itoh Y, Sekine S, Yokoyama S, Mol Cell. 2010 Aug 13;39(3):410-20. PMID: 20705242 |
This OCA 
Structure page
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(documentation).