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Streptolysin O from Streptococcus pyogenes, lyophilized powder, Protein ~3 % by Lowry, 25,000-50,000 U/vial
Streptolysin O from Streptococcus pyogenes, ≥1,000,000 units/mg protein, recombinant, lyophilized powder, expressed in E. coli
