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folic acid antagonists

pl.n.
  1. Modified pterins, such as aminopterin and amethopterin, that interfere with the action of folic acid and produce the symptoms of a folic acid deficiency.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.