lyophilized powder, >= 550 units/mg protein (biuret)
recombinant, expressed in E. coli, lyophilized powder, ≥550 units/mg protein (biuret)
Type XXIII, ammonium sulfate suspension, 550-1,100 units/mg protein (biuret), ≥2.0 mg/mL Biuret
Type XV, lyophilized powder, 200-400 units/mg protein (modified Warburg-Christian)
Type VII, ammonium sulfate suspension, ≥200 units/mg protein
Type IX, lyophilized powder, 200-400 units/mg protein (modified Warburg-Christian)
