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Histograms of the elastic modulus values of HaCaT cells measured for: a untreated cells as a control; b cells incubated with 0.5 μg/ml of P1; c cells incubated with 5 μg/ml of P1; d cells incubated with 50 μg/ml of P1; e cells incubated with 0.05 μg/ml of P2; f cells incubated with 0.5 μg/ml of P2; g cells incubated with 5 μg/ml of P2
