6J4Z:
reference: Structural insight into nucleosome transcription by RNA polymerase II with elongation factors., Ehara H, Kujirai T, Fujino Y, Shirouzu M, Kurumizaka H, Sekine SI, Science. 2019 Feb 15;363(6428):744-747. doi: 10.1126/science.aav8912. Epub 2019, Feb 7. PMID: 30733384

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