This pathway was created using information from:
* http://biocyc.org/META/new-image?type=PATHWAY&object=PWY66-301
* http://www.chem.qmul.ac.uk/iubmb/enzyme/reaction/AminoAcid/dopa.html
* http://www.chem.qmul.ac.uk/iubmb/enzyme/reaction/AminoAcid/PheTyr.html
* http://www.genome.ad.jp/dbget-bin/www_bget?pathway+map00350
* http://www.genome.jp/dbget-bin/get_pathway?org_name=rno&mapno=00400 (phenylalanine -> tyrosine)