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Observed absorbance at 600 nm of a gold colloid solution after the addition of aliquots of a solution of peptide 1 ([1] = 62 μM) exposed for different times periods to various proteases ([protease] = 44.5 nM) at pH 8 and 25°C. Filled ovals, thrombin; open ovals, plasmin; filled diamonds, factor Xa; filled squares, chymotrypsin.
