| 1XWR: reference: Structure of lambda CII: implications for recognition of direct-repeat DNA by an unusual tetrameric organization., Datta AB, Panjikar S, Weiss MS, Chakrabarti P, Parrack P, Proc Natl Acad Sci U S A 2005 Aug 9;102(32):11242-7. Epub 2005 Aug 1. PMID: 16061804 |
This OCA 
Structure page
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(documentation).