Super sonic. A gene named for a video game guides development.
Rennie
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D000818:Animals; D002642:Chick Embryo; D002645:Chickens; D029721:Drosophila Proteins; D004627:Embryonic Induction; D005121:Extremities / Q000196:embryology; D005796:Genes; D005801:Genes, Homeobox; D053823:Hedgehog Proteins; D051379:Mice; D011506:Proteins / Q000235:genetics; D015027:Zebrafish
D029721:Drosophila Proteins; D053823:Hedgehog Proteins; D011506:Proteins; C077245:hh protein, Drosophila