Figure 7From: Immobilized pH gradient-driven paper-based IEF: a new method for fractionating complex peptide mixtures before MS analysisComparative distribution of peptide pIs along the pH gradient in PIEF vs. OGE (plots A and B, respectively). The x axis represents the rank number of peptide as the peptides were first sorted in ascending order of pI value before plotting, and the y axis represents the pI. The x axis appears thick because each peptide is represented by a small vertical bar (>700 such bars are juxtaposed along the axis).Back to article page