Nature 536, 479–483 (2016); doi:10.1038/nature19084 In this Letter, during the production process, one of the images in Fig. 3a was inadvertently labelled with the incorrect PDAC cell line name. The second picture from the left should have been labelled “hPSC-LC3 + 8988T”, rather than “hPSC-LC3 + Tu8902”, to match the quantification provided in Fig.