A recent Science article attempted to identify the "kernels" of the networks made up of these objects, defining these kernels as "evolutionarily inflexible subcircuits." The duplication of a set of these objects about 520 million years ago is thought to be responsible for the Cambrian explosion. In vertebrates, they are organized into 13 paralogues and 4 clusters, and each cluster is the same size as the Ubx gene in Drosophila, the animal in which these types of genes were discovered. About 180 base-pairs long, these genes encode transcription 
A recent Science article attempted to identify the "kernels" of the networks made up of these objects, defining these kernels as "evolutionarily inflexible subcircuits." The duplication of a set of these objects about 520 million years ago is thought to be responsible for the Cambrian explosion. In vertebrates, they are organized into 13 paralogues and 4 clusters, and each cluster is the same size as the Ubx gene in Drosophila, the animal in which these types of genes were discovered. About 180 base-pairs long, these genes encode transcription factors and act on the embryo in the sequential order that they occur on the chromosome. FTP, identify this family of genes active during development which directly control an organism's body plan.
A recent Science article attempted to identify the "kernels" of the networks made up of these objects, defining these kernels as "evolutionarily inflexible subcircuits.
Hox genes or Homeobox genes