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Effect of β-tryptase concentration on the equilibrium between β-tryptase monomers and tetramers at acidic pH. Different concentrations of β-tryptase monomers were incubated at pH 6.0 in the presence of heparin. After 15 min at pH 6.0, SBTI or only buffer was added and the activity was measured. Residual activity was presumed to reflect active tetramers, while inhibited activity to reflect SBTI-inhibited active monomers.
