Complete, un-edited capture of the interactive rebuilding of 3j9d (a 747-residue model built into 3.3 Angstrom cryo-EM data: https://www.rcsb.org/structure/3j9d) using ISOLDE 1.0b2 from a MolProbity score of 3.48 to 0.99. For more information on ISOLDE, see https://isolde.cimr.cam.ac.uk.