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Hemagglutination activity of human plasma kallikrein. Human plasma kallikrein was incubated with PBS (+) only (1) or the same buffer including 1 mg/mL of fetuin (2) at room temperature for 1 h. Then, 2% rabbit red blood cell suspension was added. PBS (+) only (3) and fetuin-containing PBS (+) (4) were also used for negative controls.
