tyrosin

tyrosine, tyrosin

Tyr; a naturally occurring amino acid present in most proteins; it is a product of phenylalanine metabolism and a precursor of melanin, catecholamines and thyroid hormones.

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tyrosine hydroxylase

an oxidase which converts tyrosine to dopa.

tyrosine tolerance test

used as a test of liver function but about 85% of liver parenchyma must be lost before the test gives a positive reaction.