Find the word definition

Wikipedia
Polyporopepsin

Polyporopepsin (, Polyporus aspartic proteinase, Irpex lacteus aspartic proteinase, Irpex lacteus carboxyl proteinase B) is an enzyme. This enzyme catalyses the following chemical reaction

Milk clotting activity, broad specificity, but fails to cleave Leu-Tyr or Tyr-Leu of insulin B chain

This enzyme is isolated from the basidiomycete Polyporus tulipiferae.