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bacteriocin

(băk-tîrē-ə-sĭn′)
n.
  1. An antibacterial substance, such as colicin, produced by a strain of bacteria and harmful to another strain within the same family.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.