Fig. 4From: Label-free cell based impedance measurements of ZnO nanoparticles—human lung cell interaction: a comparison with MTT, NR, Trypan blue and cloning efficiency assaysBivariate analysis of cyclin B1 versus DNA content distribution. A549 cells treated with 1, 5 and 20 ug/cm2. STS (1μM Staurosporine) was used as positive control of apoptosis inductionBack to article page