Romogenic substrate (S-2302), specific for PK and FXIIa, was used to measure contact activation. Both strains exhibited PK/FXIIa activity on their surfaces (Fig. 1A). Interestingly, compared to the wild types, knockout of the M protein in these strains did not change PK/FXIIa activity significantly (Fig. 1A), suggesting that activation of contact system factors occurs independently of the M protei
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