The structure shown in panel 1B is a composite map of two locally refined cryo-EM maps deposited to the Electron Microscopy Data Bank with accession codes EMD-19132 (for the WDR34 region) and EMD-19133 (for the WDR60 region). The composite map can be downloaded as an 'Additional EM map', with the description 'Composite map' through entry EMD-19132.

RCSB Protein Data Bank: https://www.rcsb.org/
Electron Microscopy Data Bank: https://www.ebi.ac.uk/emdb/