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Expression of ylbO-lacZ during sporulation. Isogenic strains containing a ylbO-lacZ fusion were induced to sporulate at time zero, and samples were taken at intervals for assay of β-galactosidase activity. The strains used were otherwise wild type (● [strain BFA3241]) or carried mutations in the spoIIAC (○ [strain 1255]) or spoIIGA (▵ [strain 1256]) gene.
