4XNR:
reference: Synthesis and applications of RNAs with position-selective labelling and mosaic composition., Liu Y, Holmstrom E, Zhang J, Yu P, Wang J, Dyba MA, De Chen, Ying J, Lockett S, Nesbitt DJ, Ferre-D'Amare AR, Sousa R, Stagno JR, Wang YX, Nature. 2015 May 4. doi: 10.1038/nature14352. PMID: 25938715

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