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. Author manuscript; available in PMC: 2017 May 1.
Published in final edited form as: Neurobiol Aging. 2016 Feb 16;41:73–85. doi: 10.1016/j.neurobiolaging.2016.02.007

Fig. 2.

Fig. 2

Representative mass spectra from 16O-labeled sample (4 month-old mice) mixed with 18O labeled sample (15 month-old mice). The brain samples were obtained from DHA-adequate mice. The 18O/16O peak intensity ratio was used for relative quantitation of the peptides.