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. 2010 Sep 9;9(12):2840–2852. doi: 10.1074/mcp.M110.003731

Fig. 2.

Fig. 2.

Computing p values with MS-GF for CID/ETD pairs. Given a CID/ETD pair, MS-GFDB converts each spectrum into a PRM spectrum and merges two PRM spectra by summing scores of peaks sharing the same mass. This “summed” PRM spectrum is used to generate the score histogram of all peptides and p values are computed using the histogram.