http://en.wikipedia.org/wiki/Pharyngeal_slit
Applying excess retinoic acid (excess retincoic acid in vertebrates results in pharyngeal abnormalities) leads to the absence of gill slits in developing Amphioxus, suggesting that retinoic acid may act through the same mechanism in vertebrates and amphioxus.These studies indicate that the pharyngeal slits found in hemichordates and chordates are indeed homologous in a molecular sense.
Applying excess retinoic acid (excess retincoic acid in vertebrates results in pharyngeal abnormalities) leads to the absence of gill slits in developing Amphioxus, suggesting that retinoic acid may act through the same mechanism in vertebrates and amphioxus.These studies indicate that the pharyngeal slits found in hemichordates and chordates are indeed homologous in a molecular sense.
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