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. 2007 Dec;18(5):306–320.

FIGURE 4.

FIGURE 4

Relative peptide amounts. A. The ratio of peptides (C+C*) to peptide B is the ratio of the initial yields (Tables 4A and 4B). The horizontal line indicates the expected ratio of 4.0. The average ratio from all of the participating laboratory data was 4.27. B. The ratio of peptide C* to peptide C calculated from the picomolar amounts of Lys and acetylated Lys on sequencing cycle 4 (Table 5). The horizontal line indicates the expected ratio of 1.0. Data from Facility 660 have been omitted, and Facility 990 did not provide sufficient data to calculate a C*/C ratio. The average value for the other 21 facilities was 1.49, and data from 16 of the 21 facilities yielded ratios between 0.5 and 1.5.