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Cell surface plasmin activity. Fixed mycoplasma strains PG50 and 4 were incubated with 100 μg of human glu-plasminogen per ml. Plasminogen activation by uPA (30 IU) was then determined by incubation with the Spectrozyme-PL plasmin substrate for 30 min. Bars indicate means ± standard errors of the means (n = 3). *, statistically significant difference between strain PG50 and strain 4 (P < 0.05).
