Amino Acid Metabolism
A person with phenylketonuria will convert

tyrosine to phenylalanine
phenylalanine to phenylpyruvate
phenylpyruvate to phenylalanine
phenylalanine to isoleucine

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Amino Acid Metabolism
A ketogenic amino acid is one which degrades to

pyruvate or citric acid cycle intermediates
keto-sugars
either acetyl CoA or acetoacetyl CoA
multiple intermediates including pyruvate or citric acid cycle intermediates and acetyl CoA or acetoacetyl CoA

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