Pronunciation: me-lan'o-jen, mel'a-no-jen
A colorless substance that may be converted into melanin; some patients with widespread metastases of melanoma excrete melanogen in their urine, and melanin is formed when the urine is exposed to air (oxidized) for a few hours.
[melanin + G. -gen, producing]
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Examples: glitazone, GI cocktail, etc.