This volume examines a number of different proteases, a type of enzyme, that are required in order for the change to a biologically active mature protein to occur. The discussion of these various proteases is rarely undertaken in one volume and will serve as a great resource for scientists studying the group of proteases on signal peptide processing as well as those working on propeptide processing. These areas of research do not normally overlap, and yet they are each of common importance to the same cell processes.