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neopterin

(nē-ŏptər-ĭn)
n.
  1. A pteridine present in body fluids, elevated levels of which result from immune system activation, malignant disease, allograft rejection, and viral infections, especially in AIDS.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.