Viogene provide the most active serine protease K isolated from the fungus Tritirachium album. The enzyme exhibits broad cleavage specificity on native and denatured proteins and is widely used in the purification of DNA and RNA. Lyophilized powder can be prepared as a 20 mg/ml stock solution in water and stored in aliquots at -20°C. The enzyme is also available as a ready-to-use concentrated stock solution (600 mAU/ml) that is convenient for routine use in most applications. 1 mg of Proteinase K is the equivalent of 30 mAU (AU = Anson unit).