has role is deprotonated form of is protonated form of is tautomer of is enantiomer of L-alpha-amino acid D-phenylalanine L-phenylalanine The <small>L</small>-enantiomer of phenylalanine. micronutrient phenylalanine L-phenylalaninate L-phenylalaninium nutraceutical L-phenylalanine zwitterion EC 3.1.3.1 (alkaline phosphatase) inhibitor erythrose 4-phosphate/phosphoenolpyruvate family amino acid mouse metabolite Saccharomyces cerevisiae metabolite plant metabolite human xenobiotic metabolite Escherichia coli metabolite proteinogenic amino acid algal metabolite