Nature 551, 340–345 (2017); doi:10.1038/nature24302

In this Article, owing to an error during the production process, the text ‘(Iga is also known as Cd79a)’ was erroneously added to the sentence describing the generation of MUP-uPA/Iga−/− and STAM/Iga−/− mice; this should have stated ‘(Iga is also known as Igha)’. The original Article has been corrected online.