Function 
Dipeptidyl peptidase (DPP) is an enzyme which cleaves dipeptides from polypeptides.
  Relevance 
DPP-IV level is alternating in certain malignancies.[1] DPP-IV inhibitors control body glucose levels and provide potential advantages in diabetes type 2 therapies.[2]
  Disease 
DPP-IV is involved in the development of various chronic liver disease like hepatitis C virus infection.[3]
  Structural highlights 
Human DPP-I contains 3 chains.  and  and a  which is responsible of the exopeptidase activity of DPP-I by partially blocking the active site cleft.  The . [4]