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Differences in blaKPC expression normalized to rpoB and relative to Tn4401b. Tn4401a had significantly higher β-galactosidase activity than Tn4401b and Tn4401h (P < 0.05), and the Tn4401h putative promoter sequence had significantly higher β-galactosidase activity than Tn4401b (P < 0.05).
