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. Author manuscript; available in PMC: 2008 Jun 15.
Published in final edited form as: Anal Biochem. 2007 Mar 25;365(2):283–285. doi: 10.1016/j.ab.2007.03.024

Figure 2.

Figure 2

A. ESI spectrum of 1 μg α-casein tryptic digest. B. ESI spectrum of 1 μg α-casein tryptic digest with 20 μM PEG 4000. C. ESI spectrum of 1 μg α-casein tryptic digest with 20 μM PEG 4000 after TiO2 cleanup.