May regulate cell migration. Preferential cleavage: Arg-|-Xaa, Lys-|-Xaa. Overexpressed in metastasing in non small cell lung tumors, leading to an enhanced cell migration. Belongs to the peptidase S1 family. Tryptase subfamily. Could be the product of a pseudogene. However, some data suggest that it could be a protein-coding gene (PubMed:15313892).