Fig. 2.

Mass spectrometry (MS)-based sequencing of PrP fragments in the material extracted from individual gel bands of two GSS variants. GSS^A117V resPrP^D (a) and GSS^F198S resPrP^D (b). The material present in these bands was subjected to trypsin digestion, followed by MS analysis of tryptic fragments. The fragments identified by MS for species extracted from individual gel bands are shown as blue, red and green lines. Amino acid sequence within the 70-152 region is shown above the lines. Residues marked in red represent potential cleavage sites in the relevant region of PrP; 129M/V polymorphic residues are marked in blue