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Relative expression of spd_0088 (A), galT (B), and fruA (C) by D39 and D39luxS+ grown in CDM-Gal with or without 10 μM AI-2 was quantitated by qRT-PCR with 16S rRNA as an internal standard. Data are the total expression relative to 16S rRNA (mean ± the standard deviation of three independent experiments). *, P < 0.05; **, P < 0.01 (Student’s unpaired t test).
