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MS of F6.3 identifies C12-HSL. (A) The chemical structure of C12-HSL showing the two fragmentation ions having major peaks in electrospray MS (m/z 102 and m/z 183). (B) Comparison of the MS spectrum of synthetic C12-HSL and of the C12-HSL found in subfraction F6.3 of the culture supernatant extract of B. melitensis 16M Nalr.
