Figure S2N. Copyright: This image is from Morcillo J; Martinez-Morales JR; Trousse F; Fermin Y; Sowden JC; Bovolenta P, Development 2006; 133: 3179-90 [doi:10.1242/dev.02493] and is displayed with the permission of The Company of Biologist Limited who owns the Copyright. [PMID:16854970]