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expression vector

n.
  1. A vector, such as a plasmid, yeast, or animal virus genome, used to introduce foreign genetic material into a host cell in order to replicate and amplify the foreign DNA sequences as a recombinant molecule.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.