The dark substance produced in alkaptonuria, a rare genetic condition where the body cannot properly break down certain amino acids.
From Arabic al-qapt (to seize or contain) combined with the chemical suffix -on. The term was coined in 19th-century medical literature to describe the dark pigment found in urine of affected patients.
Alkapton is a molecular detective story—the dark urine staining was one of the first inherited metabolic disorders that helped scientists understand genetic inheritance, because the trait follows predictable family patterns.
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