Diprotin B is a dipeptidyl aminopeptidase IV (DPP IV) inhibitor.Sequence:H-Val-Pro-Leu-OHSolubility:H₂O Molecular Weight:~327.42Storage and Stability:Lyophilized powder may be stored at -20°C. Stable for 12 months at -20°C. Reconstitute with sterile buffer or dH2O. Aliquot to avoid repeated freezing and thawing. Store at -20°C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.