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Proteolytic activity of Ska (STK)-activated, streptococcus-bound Lys-plasminogen (Plg) in the presence or absence of Apl. Proteolytic activities were measured by determining cleavage of the Val-Leu-Lys-paranitroanilide chromogenic substrate. Changes in optical density (O.D.) at 405 nm were measured spectrophotometrically. The mean results from three independent experiments ± the standard error of the mean are shown. N.S., no statistically significant difference (P > 0.05).
