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Mutagenesis of the conserved sequences in the terminator stem of the pyrG leader. Nucleotides shown in boldface are those that are found at +39 to +44 in the 5′ stem of the wild-type pyrG terminator; underlined nucleotides are those that are found at +61 to +66 in the 3′ stem of the wild-type terminator. (Also see Table 3.)
