Nat. Biotechnol. doi:10.1038/bioe.2016.9; published online 22 September 2016; corrected online 11 October 2016

In the version of this article initially published, in Table 1, the H indexes for several authors were incorrect. Author names, correct index (incorrect index): Calin, 91 (69); DiMarchi, 48 (36); Sahin, 47 (6); Langer, 228 (225); Liu, 51 (34); Deisseroth, 99 (98); Zhang, 53 (42); Palese, 96 (49); and Garcia–Sastre, 101 (61). The errors have been corrected in the HTML and PDF versions of the article.