6Y53:
reference: Molecular architecture of the human 17S U2 snRNP., Zhang Z, Will CL, Bertram K, Dybkov O, Hartmuth K, Agafonov DE, Hofele R, Urlaub H, Kastner B, Luhrmann R, Stark H, Nature. 2020 Jun 3. pii: 10.1038/s41586-020-2344-3. doi:, 10.1038/s41586-020-2344-3. PMID: 32494006

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