beginDocumentation()
doc ///
    Key
    	twoSiteModificationE
	1:(twoSiteModificationE) 
    Headline
    	an example for chemical reaction motif
    Description
      Text
        A two-site phosphorylation system in which modifications are carried out by different kinases and phosphatases for each phosphoform. Simply, it is assumed that both phosphorylation and dephosphorylation occur sequentially.
      Example
        twoSiteModificationE()
      Text
        To rename species, use @TO (substitute, ReactionNetwork, List) @.		
    ///