AUTHOR=Han Qian , Phillips Robert S. , Li Jianyong TITLE=Editorial: Aromatic Amino Acid Metabolism JOURNAL=Frontiers in Molecular Biosciences VOLUME=6 YEAR=2019 URL=https://www.frontiersin.org/journals/molecular-biosciences/articles/10.3389/fmolb.2019.00022 DOI=10.3389/fmolb.2019.00022 ISSN=2296-889X