The specificity logos and frequency matrices for all peptidases with 10 or more known substrate cleavages are already available in the MEROPS database. Alignments are also available for all protein substrates that have a corresponding UniRef50 entry, showing conservation of both physiological and non-physiological cleavages. The next release of the database will include tables showing comparative peptidase specificity in terms of preference for both amino acid and amino acid type. 