An alternative or variant spelling of citrulline, an amino acid found in watermelon and other plants.
From 'citrullus' (the genus name for watermelon) plus the suffix '-in' (a chemical compound marker)—the original name before standardized chemical nomenclature settled on 'citrulline' as the accepted form.
Citrullin is the old-fashioned name that shows how scientists discovered this amino acid from watermelons and named it directly after the plant—a lovely example of botany meeting biochemistry!
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