Figure 1

Effect of long-term cryopreservation on DNA strand breaks in PBMCs (a) and WB (b). T0 refers to fresh samples that have been processed in the comet assay without cryopreservation. T2–T12 are samples that have been cryopreserved between 2 and 12 months. Data are reported as mean ± standard deviation (SD); PBMCs peripheral blood mononuclear cells, WB whole blood. a,b,c,d,e,fData with different letters are significantly different (p < 0.05).