3FQJ:
reference: Structure and function of the 5'-->3' exoribonuclease Rat1 and its activating partner Rai1., Xiang S, Cooper-Morgan A, Jiao X, Kiledjian M, Manley JL, Tong L, Nature. 2009 Apr 9;458(7239):784-8. Epub 2009 Feb 4. PMID: 19194460

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