4ER8:
reference: The processing of repetitive extragenic palindromes: the structure of a repetitive extragenic palindrome bound to its associated nuclease., Messing SA, Ton-Hoang B, Hickman AB, McCubbin AJ, Peaslee GF, Ghirlando R, Chandler M, Dyda F, Nucleic Acids Res. 2012 Aug 9. PMID: 22885300

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