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. 2002 Feb;70(2):771–778. doi: 10.1128/iai.70.2.771-778.2002

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Copyright © 2002, American Society for Microbiology

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FIG. 1. — In vitro urease activity of M6 and mutants. cag designations denote the promoter used to drive recombinant ureB expression. Strains with wild-type urease activity [M6, M6(cag9-ureB), and M6(cag25-ureB)] did not differ significantly from each other or from M6ΔureB(hpn-ureB). The urease activity of strains M6ΔureB(cag1-ureB) and M6ΔureB(cag25-ureB) was significantly less than that of the wild type and was significantly greater than zero. Urease activity of the other strains did not differ significantly from that of urease-negative M6ΔureB (see text). ∗, significantly different from M6, P < 0.05. †, significantly different from M6ΔureB, P < 0.05.