The Cdx gene family, also called caudal genes, are a group of genes found in many animal genomes. Cdx genes contain a homeobox DNA sequence and code for proteins that act as transcription factors. The gene after which the gene family is named (the founding member) is the caudal or cad gene of the fruitfly Drosophila melanogaster. The human genome ... Found on http://en.wikipedia.org/wiki/Cdx