precursor [pri:'kə:sə, pri-]

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n. ������ǰ��

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n. forerunner��harbinger��herald

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1. The precursor of the modern car was a horseless carriage with a petrol engine.
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2. These precursor cells normally go on to produce red cells, white cells or platelets.
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3. An energetic middle life is, I think, the only safe precursor of a vitally happy old age.
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n.
  1. a substance from which another substance is formed (especially by a metabolic reaction)
  2. a person who goes before or announces the coming of another
  3. an indication of the approach of something or someone

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precursor
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precursor protein
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radioactive precursor
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precursor cell
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precursor lesions
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