May be catalytically inactive. Expressed at higher level in kidney and placenta. In embryo, it is mainly confined to duodenal and stomach endoderm, mesonephros, metanephros and pancreas. The gene maps to 3q26.31, a region associated with Cornelia de Lange syndrome. However, PubMed:15168106 failed to identify specific mutations in a panel of DNA samples from patients with Cornelia de Lange syndrome. Belongs to the peptidase M28 family. M28B subfamily. Although related to the peptidase M28 family, it lacks the conserved zinc-binding and active sites and therefore has probably lost hydrolase activity. Contaminating sequence at the C-terminus.