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Effects of spo0A mutants on the expression of spoIIE-gus (A) and spoIIA-lacZ (B) transcriptional fusions. Samples were collected and assayed as described in the legend to Fig. 2. In each panel, the filled circles represent the mutant indicated. Open squares represent the wild type (JKH73). Data were averaged from at least three independent trials. Error bars, SEM. One unit of activity is defined as described in the legend to Fig. 2.
