Daniel P. Szeto and David Kimelman Development 131, 3751-3760.

The labelling in Fig. 6 of this article is incorrect.

The label for A-F should read mut1-2.0-gfp/Xex-bfp and the label for G-L should read mut1,2-2.0-gfp/Xex-bfp

The authors apologise to the readers for this mistake.