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. Author manuscript; available in PMC: 2012 Feb 1.
Published in final edited form as: Placenta. 2010 Dec 8;32(2):168–174. doi: 10.1016/j.placenta.2010.11.007

Figure 4.

Figure 4

The mass spectra of the tryptic peptide SWFEPLVEDMQR from ApoE and the corresponding isotope encoded counterpart. The intensity ratio of the two monoisotopic peaks was used to determine the concentrations of ApoE.