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a, Averaged map of the TEC region showing VP4 (cyan) and RdRP (purple), both anchored to the inner surface of the capsid (grey). b, Atomic model of VP4. c-f, The boxed regions in (b), showing density (meshes) superposed with atomic models of the GTP-binding site (c), a loop (d), a helix (e) and an RdRP-interacting loop (f).
