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. 2008 Jan 8;8:4. doi: 10.1186/1471-2180-8-4

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Copyright © 2008 Li et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Relative production of major PSMs in wild-type, ΔluxS, and ΔluxS strain with AI-2 addition. **, p < 0.01, ***, p < 0.001. Data are from the integration of extracted ion chromatograms of the two major peptide peaks produced in electrospray mass chromatograms of culture filtrates using HPLC/MS. Comparisons are vs. wild type for ΔluxS and vs. ΔluxS for ΔluxS + AI-2. No statistical analysis could be performed for PSM beta1 as there were no detectable levels of PSM beta1 in the ΔluxS strain.