Experimental proof for the regulation of Salmonella typhimurium purB by purR

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Salmonella typhimurium purB encodes adeny-losuccinate lyase (ASL), the enzyme that catalyzes step 8 in the pathway for de novo synthesis of inosine 5’-monophos-phate (IMP) and also the final reaction in the two-step sequence from IMP to adenosine monophos
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