Nature Chemistry 8, 114–119 (2016); published online 4 January 2016; corrected after print 25 January 2016.

In the originally published version of this Perspective article, reference 42 contained an incorrect article number. The reference should have read 'Maruani, A. et al. A plug-and-play approach to antibody-based therapeutics via a chemoselective dual click strategy. Nature Commun. 6, 6645 (2015).' This has been corrected in all online versions.