| 2ZXP: reference: Structure of RecJ exonuclease defines its specificity for single-stranded DNA., Wakamatsu T, Kitamura Y, Kotera Y, Nakagawa N, Kuramitsu S, Masui R, J Biol Chem. 2010 Feb 2. PMID: 20129927 |
This OCA 
Structure page
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(documentation).