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It is also found in horse's liver, being one of the putrefaction products of tyrosine.
Phenylalanine and tyrosine are needed to produce catecholamines such as adrenaline, noradrenaline and dopamine.
Its amino acid sequence shows much greater homology to consensus sequences derived from protein serine/threonine kinases than to the consensus for protein tyrosine kinases.
These have been shown to interact with and inhibit tyrosine kinases.
Some of these proteins belong to a group called the tyrosine kinases.