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 C16 palmitate product of the fatty acid biosynthetic pathway can be esterifed to triacylglycerol or converted to longer chain saturated and unsaturated fatty acid molecules by elongases and desaturases, depending on the needs of the cell. The elongation pathway takes place in the endoplasmic reticulum or in the mitochondrion. Longer chain fatty acids are present in certain specialized tissues; for instance, myelin contains large amounts of C22 and C24 molecules.