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. 2021 Aug 27;13(9):1345. doi: 10.3390/pharmaceutics13091345

Figure 1.

Figure 1

Mechanism of action of PDT demonstrating Type I and Type II reactions. PSEs, PS excited singlet state; PSEt, PS excited triplet state; ROS, reactive oxygen species. Reprinted with permission from ref. [26]. 2016 Calixto et al.