Reactive oxygen species production in marine microalgae

All living cells produce reactive oxygen species (ROS) as a byproduct of metabolism. ROS are reduced oxygen intermediates that include the superoxide radical (O2−) and the hydroxyl radical (OH•), as well as the non-radical species hydrogen peroxide (H2O2).

Source: Wikipedia — Reactive oxygen species production in marine microalgae (CC BY-SA 4.0)