Figure 5: ROS production induced by (A) FeCp2 or (B) FeCp2BF4 generated on MCF7 cells at concentrations ranging from 25 to 3000 μM or 2.5 to 300 μM, respectively, and at different time of exposure. Significant increments were observed at concentrations 1000 μM FeCp2 or higher and 100 μM FeCp2BF4 or higher.