Nature 496, 187–192 (2013); doi:10.1038/nature12062

Owing to an editorial oversight, accession numbers for the negative-stain electron microscopy maps for this Article were not obtained. The electron microscopy maps have been deposited in the Electron Microscopy Data Bank (http://emdatabank.org) for all of the structures shown in the main text and in the Supplementary figures. The accession codes are 5804 (the stable major conformation of Teb1-F telomerase analysed in detail) and 5807–5824 (from minor conformations of Teb1-F telomerase, TERT-F telomerase, and Fab-labelled TERT-F, Teb1-F and F-p50 telomerase).