Type I, salt-free, lyophilized powder, ≥150 units/mg protein
Type III, salt-free, lyophilized powder, ≥30 units/mg protein
ammonium sulfate suspension, 1,500-3,000 units/mg protein (biuret)
buffered aqueous glycerol solution, ≥1,000 units/mg protein (biuret)
buffered aqueous glycerol solution, ≥10 units/mg protein (modified Warburg-Christian)
Type IV, lyophilized powder, 20-60 units/mg protein (modified Warburg-Christian)
recombinant, expressed in E. coli BL21, ≥10 units/mg protein
5 units/μL; with 10× PCR reaction buffer containing MgCl2