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Most advanced teleosts lack l-gulono-gamma-lactone oxidase (GULO), a key enzyme required for the biosynthesis of ascorbic acid. However, extant representatives of primitive species including sturgeon and many cartilaginous fishes, are exceptional in their ability to synthesize ascorbic acid de novo. In the present study, full-length GULO cDNAs were isolated from white sturgeon (Acipenser transmontanus)...
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