Nat. Cell Biol. 15, 885–887 (2013); published online 1 August 2013; corrected after print 2 August 2013
In the version of this News and Views originally published, there was an error in Fig. 1: the blue cell on the right should have been labelled 'Adult HSC', not 'Fetal HSC'. This has been corrected in the HTML and PDF versions.
The online version of the original article can be found at 10.1038/ncb2817