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Asparagine and glutamine are major forms of nitrogen in the phloem sap of many higher plants. In vascular plants, glutamine-dependent asparagine synthetase (AS) is the primary source of asparagine. In Escherichia coli, asparagine is synthesized by the action of two distinct enzymes, AS-A which utilizes ammonia as a nitrogen donor, and AS-B which utilizes both glutamine and ammonia as substrates, but...
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