There was an error in Development (2009) 136, 3057-3065 (doi:10.1242/dev.036855).
In the legend of Fig. 6, the same image was inadvertently used for the control samples in panels A and G.
The authors apologise to readers for this error, which does not impact the results or conclusions of this article.
© 2022. Published by The Company of Biologists Ltd
2022