5X51:
reference: Crystal structure of RNA polymerase II from Komagataella pastoris., Ehara H, Umehara T, Sekine SI, Yokoyama S, Biochem Biophys Res Commun. 2017 May 27;487(2):230-235. doi:, 10.1016/j.bbrc.2017.04.039. Epub 2017 Apr 12. PMID: 28412353

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