Figure 2From: Genotoxicity of nano/microparticles in in vitro micronuclei, in vivo comet and mutation assay systems Frequency of micronucleated A549 cells incubated with C 60 CB or kaolin. The values represent the mean of three experiments ± SD. An asterisk (*) represents that each frequency is significantly different (p < 0.01) from that of control cell in a Student's t-test. Concentrations in μg/cm2 are given in parenthesis.Back to article page