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Figure 1 Escalating superparamagnetic microsphere dose inhibits cell proliferation. Exposure of endothelial outgrowth cell (EOC) to escalating doses of superparamagnetic microsphere (SPM) results in a small but significant decrease in bromo-deoxyuridine (BrdU) incorporation at high, but not at low doses. * p < 0.05 versus no SPM.