| 1IFS: reference: X-ray structure of recombinant ricin A-chain at 1.8 A resolution., Weston SA, Tucker AD, Thatcher DR, Derbyshire DJ, Pauptit RA, J Mol Biol 1994 Dec 9;244(4):410-22. PMID: 7990130 |
This OCA 
Structure page
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(documentation).