A simplified example of a protein summary list. A simplified example of a protein summary list. Peptides are apportioned among all their corresponding proteins, and the minimal list of proteins is derived that can explain all observed peptides. Proteins that are impossible to differentiate on the basis of identified peptides are collapsed into a single entry (F and G) or presented as a group (H, I, and J). Shared peptides are marked with an asterisk. Proteins that cannot be conclusively identified are shown at the end of the list but do not contribute toward the protein count. Alexey I. Nesvizhskii, and Ruedi Aebersold Mol Cell Proteomics 2005;4:1419-1440 The American Society for Biochemistry and Molecular Biology