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. 2002 Oct;46(10):3265–3267. doi: 10.1128/AAC.46.10.3265-3267.2002

FIG. 2.

FIG. 2.

Detection of the −11 mutation in the ampC gene promoter of E. coli by MaeIII digestion. Lanes: M, molecular size marker; 1 and 3, E. coli strain 99004202 promoter; 2, strain ATCC 25922 promoter; B, blank.