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Copyright: 2014 The PLOS ONE Staff. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Figure 4. Heterogeneity of hbl expression in planktonic cultures and in biofilms. A: Flow cytometry analysis of bacteria expressing Phbl’yfp in planktonic cultures or in biofilms, shown as histogram plot. The blue-filled curve shows biofilm data, the yellow-filled curve shows planktonic cultures data and the unfilled dashed curve shows data from bacteria lacking yfp. B: Flow cytometry analysis of bacteria expressing Papha3’-yfp in biofilms (blue-filled curve) compared to bacteria lacking yfp (unfilled dashed curve), shown as histogram plot. C: Expression from the hbl promoter was monitored in planktonic cultures and in biofilms by epifluorescence microscopy through a transcriptional fusion to yfp. Cell limits are shown by the membrane stain FM4-64 (red). doi:10.1371/journal.pone.0087532.g004

Correction: SinR Controls Enterotoxin Expression in Bacillus thuringiensis Biofilms