Detailed view of the section of the deposited model in which a possible sequence-register error was detected using conkit-validate. The density map is represented as a transparent grey surface and the level was set to 1.35σ. A mask of 3 Å around the model was applied. The original deposition is coloured red and the structure with the sequence register suggested by conkit-validate is in blue. Residues 148 and 142 have been highlighted for clarity. The error corresponds to PDB entry 7l6q chain B residues 138–148.