tinman, a Drosophila homeobox gene required for heart and visceral mesoderm specification, may be represented by a family of genes in vertebrates: XNkx-2.3, a second vertebrate homologue of tinman.

Abstract excerpt

tinman is a Drosophila Nk-homeobox gene required for heart and visceral mesoderm specification. Mutations in tinman result in lack of formation of the Drosophila heart, the dorsal vessel. We have isolated an Nk-homeobox gene from Xenopus laevis, XNkx-2.3, which appears by sequence homology and expression pattern to be a homologue of tinman. The expression pattern of XNKx-2.3 both during development and in adult...

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