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. 2012 Apr 21;12(7):1045–1058. doi: 10.1002/pmic.201100550

Figure 4.

Figure 4

Schematic diagram showing the importance of cleaving methylene bridges of FFPE protein extracts for proper endopeptidase digestion. Methylene bridges prevent trypsin or other endopeptidases reaching its active cleaving site, leading to improper digestion and the existence of cross-linked peptides.