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homobiotin

(hō′mə-bīə-tĭn)
n.
  1. A homologue of biotin that acts as an active antagonist of biotin for some bacteria and as a replacement for biotin in certain functions for other organisms.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.