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nucleic-acid probe

n.
  1. A nucleic-acid fragment that is complementary to another nucleic-acid sequence and thus, when labeled in some manner, as with a radioisotope, can be used to identify complementary segments present in the nucleic-acid sequences of various microorganisms.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.