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).
The pathways by which water flows into and out of the cell and into and out of sub-cellular compartments for multi-cellular organisms, mediated by members of the aquaporin family of water channels (WCP). The 13 members identified in mammals are grouped into three subfamilies: aquaporins, selective for water; aquaglyceroporins, permeable to both water and small molecules; superaquaporins, the sub-cellular aquaporins. WCPs belong to the superfamily of major intrinsic proteins (MIPs).