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. 2020 Jul 17;8:822. doi: 10.3389/fbioe.2020.00822

FIGURE 2.

FIGURE 2

NPs induced ROS production in cells, transition metal ions (Men+), or organic compounds may act as initiators of metabolic reactions that generate ROS and they can be released from particle impurities and catalyzing Fenton-type reactions. Also, in some metallic photosensitizer NPs light exposure facilitates the ROS production. Reproduced from Kehrer and Klotz (2015) with permission.