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. 2022 Oct 4;42:40. doi: 10.1186/s41232-022-00226-6

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Fig. 1 — Simplified Jablonski diagram illustrating the formation of singlet oxygen and other reactive species by transferring energy between states and from PS in excited states to molecular oxygen. Type I reaction defines by transferring an electron to biomolecules or directly to oxygen to produce ROS. A type II reaction involves energy transfer from the excited PS to molecular oxygen and producing singlet oxygen