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Slot blot analysis of the S. sobrinus 6715 putative ptsG gene in response to changes in environmental pH. Total RNA was isolated from S. sobrinus 6715 grown in the chemostat under the conditions indicated in the figure (s.s., steady state). Hybridization was performed with an internal fragment of the S. sobrinus ptsG gene. RNase-treated samples were used as controls (data not shown).
