Figure 7. Macrophages were incubated in the absence (control) or presence of 1, 10, and 100 µg/ml of SPIO particles for 1, 4, 24, and 48 h.

The effect of SPIO particles on cell viability was determined via MTT assays immediately after incubation. Data are expressed as the mean and error of three determinations, with each assay performed in triplicate. Dunnett's test treats one group as a control and compares all other groups against it. *p<0.05.