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Venn diagrams of (a) spectral pairs identified against the IPI-Human database within peptide level FDR 1% and (b) spectral pairs identified against the decoy database with p values corresponding to peptide level FDR 1% or less. The number of peptides (the number of spectral pairs in parentheses) are shown. The grey numbers correspond to the number (percentage in parentheses) of spectral pairs where CID and ETD identifications disagree.
