..., including neural crest, placodes, cartilage and bone. Sox9 is important for the development of these features, and zebrafish has two co-orthologs of tetrapod SOX9 stemming from an ancient genome duplication event in the lineage of ray-fin fish. We have used a genotype-driven screen to isolate a mutation...

..., as only one very diverged non-Hox cluster gene, AHoxl , was described. * Author for correspondence © 1994 by Company of Biologists 1994 homeobox echinoderms ascidians gene families genome duplication The homeobox system of genes is generally recognized as having useful...