<p>Cells were incubated with or without DIF and subjected to ChIP analysis. The absolute recoveries from the procedure varied from experiment to experiment, (three independent experiments with triplicate Q-PCR analyses in each). Therefore values are normalized to the induced signal for the <i>ecmA</i> positive control and are shown with their Standard Deviations. Student's paired T test was applied to the <i>pspA</i> analysis with and without DIF-1 and in samples immuno-precipitated from GFP-DimB transformant cells. As indicated by the asterisk the induction by DIF is significant with a P<0.05.</p
