The team from Kolkata’s CSIR-Indian Institute of Chemical Biology, Republic of Korea’s Institute for Basic Science (IBS), Kolkata’s Vidyasagar College and the Institute of Postgraduate Medical Education and Research (IPGMER) here has in a recent study answered a long standing question as to why diabetics have more amount of an enzyme called dipeptidyl peptidase 4 or DPP4 in their blood. To rein in the levels, diabetics take a group of pills called DPP4 inhibitors: sitagliptin, vildagliptin, saxagliptin etc. But why diabetic patients start accumulating DPP4 in the blood is still an enigma.