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streptonigrin

(strĕp′tə-nīgrĭn)
n.
  1. A highly toxic antibiotic produced by a species of the genus Streptomyces and active against various tumors.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.