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B2133 N-Benzoyl-Pro-Phe-Arg-p-nitroanilide hydrochloride protease substrate  
K3628 Kininogen, low molecular weight from human plasma ≥95% (SDS-PAGE), lyophilized powder LMW kininogen is a major extracellular cysteine proteinase inhibitor. Tissue kallikrein releases bradykinin, a potent bronchoconstrictor and vasoactive agent, from both HMW and LMY kininogen.
C9521 Z-Phe-Arg 7-amido-4-methylcoumarin hydrochloride kallikrein substrate