A Protein Group is a collection of proteins identified by a set of peptides. In details, a Protein Group:

• is represented by a master (or typical) protein
• contains a collection of peptides identifying this master protein
• contains a collection of proteins having the sameset of peptides
• contains a collection of proteins having a subset of peptides

A Protein Group is quite similar to a Mascot protein hit, but operates at the Context level.

Protein groups are obtained when running the Protein Grouping algorithm on a given context.

1. Right-click on the User context of your choice (for which protein grouping has been executed) in the MSIExplorer window and select “Browse→Protein groups” in the context sensitive menu
2. Browse Protein Groups in the ContextExplorer window

Master protein is represented by

1. Right-click on the protein group of your choice in the ContextExplorer window and select “View Protein” in the context sensitive menu