FIG. 3.

Growth phase-dependent expression of PGH genes. (A) Northern blot analysis of PGH gene expression. Total RNAs were prepared from L. lactis MG1363 cells grown in CDM to different OD₆₅₀ values and analyzed by Northern blotting with probes specific for each gene. The hybridization signals were imaged and quantified with a Storm system. The transcript amount was standardized by the amount of 16S rRNA in each sample. (B) Growth was monitored by OD₆₅₀ measurements.