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pH-dependent expression of lacZ gene fusions. β-Galactosidase activity is expressed in specific activity units (51). Cultures were grown in buffered LBK to different OD600 values, and β-galactosidase activity was assayed as described in Materials and Methods. (A) JLS0711 (sdaA::lac); (B) JLS0215 (gadA::lac); (C) JLS0214 (gadB::lac). The data are means ± standard errors for four independently grown cultures.
