4J7L:
reference: A mammalian pre-mRNA 5' end capping quality control mechanism and an unexpected link of capping to pre-mRNA processing., Jiao X, Chang JH, Kilic T, Tong L, Kiledjian M, Mol Cell. 2013 Apr 11;50(1):104-15. doi: 10.1016/j.molcel.2013.02.017. Epub 2013 , Mar 21. PMID: 23523372

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