| 1XEZ: reference: Crystal Structure of the Vibrio cholerae Cytolysin (VCC) Pro-toxin and its Assembly into a Heptameric Transmembrane Pore., Olson R, Gouaux E, J Mol Biol 2005 Jul 29;350(5):997-1016. PMID: 15978620 |
This OCA 
Structure page
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(documentation).