Fig. 2.
Protease inhibitors. a, number and identity of peptides and proteins identified in urine samples collected with or without addition of protease inhibitors. The numbers in parentheses represent the number of identified proteins (and peptides) for each sample type. The peptide Venn diagram displays the number of unique peptides with ≥20% confidence that are used in identifying and quantitating the proteins. b, ratio of iTRAQ intensity for each of the 83 identified proteins in PI+ samples (with protease inhibitors) to PI− samples (without protease inhibitors).