Extended Data Fig. 2: Overview of cryo-EM density map quality.

a, Density maps for the RS head-neck complex, colored by local resolution, estimated using RELION. b, Angular orientation distribution of all particles used in the final 3D reconstruction of each map. c, Fourier Shell Coefficient (FSC) curves measured by the Gold-standard method using RELION. d, Examples of density in various regions of the composite map for the RS head-neck complex.