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Expression of lacZ fusions to sporulation-specific promoters. Strains AWS154 (citB+ spoIIA-lacZ; circles) and AWS153 (citB5 spoIIA-lacZ; triangles) (top) or strains AWS145 (citB+ cotA-lacZ; circles) and AWS137 (citB5 cotA-lacZ; triangles) (bottom) were grown in DSM at 37°C. Samples were removed for measurement of the OD600 (closed symbols) and for assay of β-galactosidase activity (open symbols).
