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It was found in a previous study that Mycobacterium tuberculosis protein tyrosine phosphatase ptpAt promoter is a highly active promoter in slow-growing species of mycobacteria, such as M. tuberculosis and M. bovis BCG, but inert in fast-growing mycobacterial species, such as M. smegmatis. This difference is presumed to be due to the differences between sigma factors systems of slow-growing pathogenic...
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