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Expression of arginine-related genes during growth of S. gordonii in CDM (0.5 mM arginine). The expression of arginine biosynthesis genes (argC, argG, and pyrAb) or a control gene (amyB) was monitored during growth in monoculture (•) or in coculture (▪) or coaggregation (▴) with A. naeslundii. The abundance of transcripts was quantified using Q-RT-PCR, and expression levels relative to those in the monoculture at 1 h are shown.
