Fig. 5.

The cartilages deriving from maxillary arch 1 in zebrafish are critically dependent on Shh signaling. Flat mounts of Alcian-blue-stained neural cranial cartilages with bilateral palatoquadrates attached. (A) Wild-type embryo. (B) shha homozygous mutant. The anterior neural cranial cartilages and the pterygoid process of the palatoquadrates are deleted and the posterior regions of the palatoquadrates are fused at the midline. E, ethmoid plate; ptp, pterygoid process; pPQ, posterior palatoquadrate; T, trabecula. From Eberhart et al. (2006).