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Susceptibility of E. coli DH5α expressing the aac(2′)-IIa gene to aminoglycosides. The 91-bp promoter region (P) of aac(2′)-IIa gene is not contained (P−) or contained (P+) in pUC118 vector. NM, neomycin; KM, kanamycin; TOB, tobramycin; GM, gentamicin.
