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Distribution of blaCTX-M group 1 cloned gene sequences in each library grouped according to the most similar reference sequence variants. Only validated blaCTX-M sequences from www.lahey.org/Studies/ were used as references. TRE, Tijuana River Estuary; PLE, Point Loma Wastewater Treatment Plant effluent; SBI, South Bay International Wastewater Treatment Plant. Color images available online at www.liebertpub.com/mdr
