from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A white crystalline amino acid, C9H11NO3, that is obtained from the hydrolysis of proteins such as casein and is a precursor of epinephrine, thyroxine, and melanin.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A nonessential amino acid C9H11NO3 found in most animal proteins, especially casein.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. an amino acid found in most proteins; a precursor of several hormones


from The American Heritage® Dictionary of the English Language, 4th Edition

Greek tūros, cheese; + -ine.

from Wiktionary, Creative Commons Attribution/Share-Alike License

Ancient Greek cheese.


  • Then it moves sugar into cells by activating an enzyme called tyrosine-kinase.

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  • The parasite infects the brain by forming a cyst within its cells and produces an enzyme called tyrosine hydroxylase, which is needed to make dopamine.

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  • Btk is a type of enzyme known as a tyrosine kinase inside B-cells that plays an early key role in B-cell activation. Featured News and Stories

  • Gleevec clamps down on the cell's accelerator, a protein called tyrosine kinase, which drives cancer to reproduce.

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  • So-called tyrosine kinase inhibitor drugs such as imatinib, marketed by Swiss drugmaker Novartis as Glivec or Gleevec, and dasatinib, sold by Bristol-Myers Squibb as Sprycel, have transformed treatment of CML and are credited with turning it from a fatal cancer into a manageable condition.

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  • When a leukemia drug was used in turn to block the enzyme - called tyrosine kinase c-Abl - it prevented destruction of those healthy cells. Chronicle

  • Protein contains tyrosine, which is converted into the alertness neurotransmitter, dopamine. | Top Stories

  • Both of these older drugs, respectively known generically as dasatinib and nilotinib, are members of a class called tyrosine kinase inhibitors.

    Reuters: Press Release

  • But by the 1990s, at Sugen, he was doing something very different, developing cancer-fighting pills that work by blocking enzymes called tyrosine kinases that cells use to communicate with one another.

  • For example, if the tumor being tested has certain types of EGFR mutations and does not have a K-RAS mutation, the oncologist may decide to treat the patient with a class of drugs called tyrosine kinase inhibitors.

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