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The cluster of genes of capsular K5 heparosan is composed of three regions, involved in the synthesis and the exportation of the polysaccharide. The region 2 possesses all the necessary genes involved in the synthesis of heparosan, namely kfiA, encoding alpha-4-N-acetylglucosaminyltransferase, kfiD, encoding β-3-glucuronyl transferase, kfiC, encoding UDP-glucose dehydrogenase (UDP-glucuronic acid...
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