The Pathway Ontology (PW), is currently being developed at the Rat Genome Database. For more information about this vocabulary, please see Petri et al. The rat genome database pathway portal. Database (Oxford). 2011 Apr 8;2011:bar010. Print 2011 or contact us (http://rgd.mcw.edu/contact/index.shtml).
Protocadherin represent a very large family which can be further subdivided into two groups. The protocadherin are predominantly expressed in the nervous system. They have up to seven cadherin repeats but distinct and even divergent cytoplasmic regions.