Wnt/beta-catenin signaling is essential for the specification of dorsal cell fate in amphioxus, suggesting a common evolutionary origin for the formation of the dorsal organizer in chordates.
A gene regulatory network model provides a simplified explanation of the molecular interactions that orchestrate muscle development in the sea urchin embryo.
The animal phylogeny of glutamate receptors indicates that vertebrate types do not account for all receptor classes originated during evolution, neither are they the pinnacle of a linear evolutive process.
