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Contact activation of prekallikrein in vitro by carrageenan or lipopolysaccharide (LPS). Rat plasma was added to carrageenan, LPS or saline (control) and the amidolytic cleavage of a specific kallikrein substrate (MBz-Pro-Phe-Arg-pNA) was recorded during 30 min. Data are expressed as the mean ± SEM of four experiments.
