Meprin B
Meprin B (, meprin-b) is an enzyme. This enzyme catalyses the following chemical reaction

 Hydrolysis of proteins, including azocasein, and peptides. Hydrolysis of -His5-Leu-, -Leu6-Cys-, -Ala14-Leu- and -Cys19-Gly- bonds in insulin B chain

This membrane-bound metalloendopeptidase is present in mouse intestines.