4PJS:
reference: An artificial PPR scaffold for programmable RNA recognition., Coquille S, Filipovska A, Chia T, Rajappa L, Lingford JP, Razif MF, Thore S, Rackham O, Nat Commun. 2014 Dec 17;5:5729. doi: 10.1038/ncomms6729. PMID: 25517350

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