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Comparison of promoter sequences of the β-lactamase genes blaTEM-2 (10), blaTEM-1b (10), blaTEM-1a (25), blaTEM-1f (15, 16), and blaTEM-71. The differences are shown in boldface. The −35 and −10 regions of Pa, Pb, and P3/P4 are boxed. The start codon is indicated. The nucleotide positions are numbered according to Sutcliffe (25).
