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melanogen

(mĕ-lănə-jən, -jĕn′, mĕlə-nō-jĕn′)
n.
  1. A colorless precursor of melanin.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.