4CZX:
reference: An asymmetric PAN3 dimer recruits a single PAN2 exonuclease to mediate mRNA deadenylation and decay., Jonas S, Christie M, Peter D, Bhandari D, Loh B, Huntzinger E, Weichenrieder O, Izaurralde E, Nat Struct Mol Biol. 2014 Jun 1. doi: 10.1038/nsmb.2837. PMID: 24880343

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