Data and code availability
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The atomic structure coordinates have been deposited in the RCSB Protein DataBank (PDB) under the accession numbers PDB: 7TNW and PDB: 7TO4 and the electron microscopy maps deposited in the Electron Microscopy DataBank (EMDB) under the accession numbers EMDB: EMD-26021 and EMDB: EMD-26029, and they are publicly available. These accession numbers are also listed in the key resources table.
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This paper does not report original code.
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Any additional information required to reanalyze the data reported in this paper is available from the lead contact upon request.