Definitions for xanthopterin
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Wiktionary
xanthopterin(Noun)
A yellow crystalline solid that occurs mainly in the wings of butterflies and in the urine of mammals, converted by microorganisms into folic acid.
U.S. National Library of Medicine
Xanthopterin
2-Amino-1,5-dihydro-4,6-pteridinedione. Pigment first discovered in butterfly wings and widely distributed in plants and animals.
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"xanthopterin." Definitions.net. STANDS4 LLC, 2013. Web. 21 May 2013. <http://www.definitions.net/definition/xanthopterin>.