A chemical compound or pigment that differs in color or composition from standard xanthine (a compound found in animal tissues).
From 'hetero-' (different) and 'xanthine' (from Greek 'xanthos' meaning yellow), a biochemical term from the late 1800s.
Xanthine chemistry is fascinating because these yellow compounds appear everywhere—in coffee, tea, and even in bird feathers—and heteroxanthine represents the many variations nature creates from the basic xanthine template.
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