Definition: A set or series of interactions, often forming a network, which biologists have found useful to group together for organizational, historic, biophysical or other reasons. Comment: It is possible to define a pathway without specifying the interactions within the pathway. In this case, the pathway instance could consist simply of a name and could be treated as a 'black box'. Synonyms: network Examples: glycolysis, valine biosynthesis
Source:http://www.biopax.org/release/biopax-level2.owl#pathway