MEROPS: the peptidase database

Important additions have been made to the MEROPS database (http://www.bi.bbsrc.ac.uk/Merops/Merops.htm). These include sequence alignments and cladograms for many of the families of peptidases, and these have proved very helpful in the difficult task of distinguishing the sequences of peptidases that are simply species variants of already known enzymes from those that represent novel enzymes.