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uroporphyrin

(yur′ō-pôrfə-rĭn)
n.
  1. A porphyrin excreted in the urine, such as urobilin.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.