preincubation of lipopolysaccharides ( lps ) of bacteroides fragilis , bacteroides vulgatus , and fusobacterium mortiferum with purified human hageman factor ( hf ) followed by addition of purified human prekallikrein resulted in the activation of hf , as measured by the generation of kallikrein using the tripeptide substrate n-alpha-benzoyl-l-proline-l-phenylalanine-l-arginine-4-nitroanilide .
C0033024
prekallikrein
C0022478
kallikrein