Enzyme vial (supplied with (Hepatocyte Isolation System Kit , Catalog No. H2006-02) that contains 20,000 units of collagenase and 30 units of elastase, filtered through 0.22 micron membrane and lyophilized.Source:Clostridium histolyticumActivity: ≥20,000 units collagense/30 units elastase per vialCollagenase:≥125 units/mg dry weightCollagenase: ≥ 20,000 units/vialCaseinase:≥ 200 units/mg dry weightClostripain:≤ 4.0 units/mg dry weightTryptic:≤ 0.5 units/mg dry weightColony Count: ≤1 cfu/mlElastase:≥ 230 units/vialCountry of Origin: All products from animal sources are produced from starting material of USDA-approved origin, collected in United States Department of Agriculture (USDA) or equivalent approved facilities, inspected to be free of disease and suitable for exportation.Storage and Stability: Lyophilized powder may be stored at 4°C. Stable for 12 months after receipt at 4°C. For maximum recovery of product, centrifuge the original vial prior to removing the cap.