Fig. 2

The human protein gene symbols identified by endogenous tryptic peptides and/or phosphopeptides using Filter 2 where precursor intensity is greater than E4 (10,000) arbitrary detector counts from the SEQUEST plus X!TANDEM algorithm after selecting the best fit of MS/MS spectra from 2+ or 3+ ions and selecting the single best peptide fit for each MS/MS fragmentation set and thus rejecting the redundant correlation of the same MS/MS spectra more than once. a log peptide counts per protein accession; b log₁₀ peptide counts per gene symbol