6AGB:
reference: Structural insight into precursor tRNA processing by yeast ribonuclease P., Lan P, Tan M, Zhang Y, Niu S, Chen J, Shi S, Qiu S, Wang X, Peng X, Cai G, Cheng H, Wu J, Li G, Lei M, Science. 2018 Sep 27. pii: science.aat6678. doi: 10.1126/science.aat6678. PMID: 30262633

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