Gerry Weinmaster and Raphael Kopan

There was an error published in Development133, 3277-3282.

There was a mistake in the first paragraph of this meeting review, which should read as follows:

Hosted by the Cantoblanco Workshops on Biology and organized by JoséLuis de la Pompa, Tom Gridley and Juan Carlos Izpisúa Belmonte, the meeting covered diverse aspects of this important signaling pathway.

The authors apologize to readers for this mistake.