Nature 542, 450–455 (2017); doi:10.1038/nature21365

In this Article, in Fig. 4f–h, the x-axis labels ‘WT + exoKO’ and ‘ADicerKO + exoKO’ were inadvertently reversed, and in Fig. 5c, f, the y-axis labels should have been labelled ‘miR-302f 3′UTR total flux’ rather than ‘Fgf21 3′UTR total flux’. In Fig. 4b and f, the units for the y-axis labels should have been listed as ‘(photons s−1)’ instead of ‘(photons s−1 × 1010)’. The data in all panels remain unchanged, and these errors do not affect the results or conclusions of the Article. We apologize for these errors. In addition, the following sentence has been added to the Fig. 4 legend for added clarity: “Note that the order of the data in fh is different from the order of the mice shown in e because the IVIS scan was done in a blinded fashion.” The original Article has been corrected online.