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. 2016 Feb 10;6:20702. doi: 10.1038/srep20702

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(A) Mass spectra of C4-HSL (m/z 172.0000) (marked by arrow). (B) Mass spectra of C6-HSL (m/z 200.3000) (marked by arrow). (C) Mass spectra of C8-HSL (m/z 228.2000) (marked by arrow). (D) Mass spectra of C16-HSL (m/z 340.0000) (marked by arrow).