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Glutamine:fructose-6-phosphate aminotransferase (GFAT) catalyzes the formation of glucosamine-6-phosphate, and its gene is one of the genes essential for microbes. Using the GFAT-encoding gene can prevent the use of a drug-resistant gene as a selection marker in a bacterial system. Another unique property of the GFAT selection marker is that no particular compound is prohibited or required for creating...
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