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...of the body to metabolize the amino acid phenylalanine. Phenylalanine is normally converted in the human body to tyrosine, another amino acid, by a specific organic catalyst, or enzyme, called phenylalanine hydroxylase. This enzyme is not active in individuals who have phenylketonuria.
Phenylalanine (US: /ËfÉnÉlËÃ¦lÉniËn/, UK: /ËfiËnaÉªlËÃ¦lÉniËn/; abbreviated as Phe or F) is an Î±-amino acid with the formula C. 9H. 11NO. 2. It can be viewed as a benzyl group substituted for the methyl group of alanine, or a phenyl group in place of a terminal hydrogen of alanine.