| 2O0H: reference: The structure of the ATPase that powers DNA packaging into bacteriophage T4 procapsids., Sun S, Kondabagil K, Gentz PM, Rossmann MG, Rao VB, Mol Cell. 2007 Mar 23;25(6):943-9. PMID: 17386269 |
This OCA 
Structure page
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(documentation).