... between these two bulges, resulting in the formation of mature PP2 with a bilayered morphology. The rostral and caudal bulges develop into the operculum and gill, respectively. Development of the caudal PP2 and more posterior PPs is affected by impaired retinoic acid signaling or pax1a/b dysfunction...

... opercular apparatus of teleosts. * Author for correspondence (e-mail: [email protected] ) 3 12 2002 © 2003. 2003 Endothelin 1 Pharyngeal arch Branchial arch Operculum Dermal bone Morphogen Zebrafish Teleosts are highly derived ray-finned fish and comprise...