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KPK does not compete for the effect of KLK by simultaneous application of KLK and KPK. T24 cells expressing GPI-hFR-mGFP were incubated with 1 mM KPK for 5 min followed by simultaneous application of 1 mM KPK and 100 μM KLK for 10 min. Scale bar 15 μm.
