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. Author manuscript; available in PMC: 2015 Sep 1.
Published in final edited form as: J Endod. 2014 Apr 13;40(9):1342–1348. doi: 10.1016/j.joen.2014.02.017

Figure 4.

Figure 4

MS/MS spectra of serine lipids of P. gingivalis and P. endodontalis. Lipids were extracted and fractionated as described in the Materials and Methods. Highly enriched fractions of the respective serine lipids were analyzed by MS/MS by setting the precursor negative ion to m/z 653 and monitoring product ions from m/z 50 to 700. Note that both MS/MS spectra are essentially identical and are consistent with the previously reported serine lipid, Lipid 654 (11).