The graph in the News story ‘Gene data to hit milestone’ ( Nature 487, 282–283; 2012) miscounted data sets in ArrayExpress for the years 2003–11. The corrected graph can be seen online at go.nature.com/2wrlpx.

The News Feature ‘Beta test’ ( Nature 487, 160–162; 2012) gave the wrong affiliation for Stefan Schönert. He is at the Technical University Munich.