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insertion sequence

n.
  1. Any of several discrete DNA sequences that repeat at various sites on a bacterial chromosome, on certain plasmids, and on bacteriophages and that can move from one site to another on the chromosome, to another plasmid in the same bacterium, or to a bacteriophage.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.