Peptides including HisGlyTrpSerTyrGlyGlyPheLeu; LeuAspGluAsnValHisPhePhe;
GluArgHisSerIleArg and PheValIleGlnGluGluPhe which show peptidase ability
and have substrate specificity for at least one of the compounds
H-Ala-Pro-pNA, H-Gly-Pro-pNA and H-Arg-Pro-pNA are disclosed. Nucleic
acids, vectors, antibodies and hybridoma cells are also claimed with
reference to the above sequences and their abilities.