However, later in the cascades of nearly all insects and vertebrates, the Hox genes play a role in identifying each segment and defining what part of the body each segment will become (Figure 5).

Figure 3: Expression patterns of Hox genes in the vertebrate hindbrain. Figure 4: Patterns of neural crest migration and branchial arch Hox gene expression in chick and mouse embryos.

Hox genes are a group of approximately 40 genes that control ... and demonstrate that the situation applies not only to Drosophila but to all vertebrates (The EMBO Journal, 22:3737-3748 ...

To answer the question of why mammals have five fingers, we must first understand why tetrapod (Greek for "four-footed") ...

"Differential regulation by retinoic acid of the homeobox genes of the four HOX loci in human embryonal carcinoma cells ... Italy): "This paper put some order into the zoo of vertebrate homeobox genes ...