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Fig. 3 | Cancer Cell International

Fig. 3

From: The role of photodynamic therapy on multidrug resistant breast cancer

Fig. 3

The photosensitization process of PDT. When PS absorbs photon energy, it transits from ground singlet state (PS) to an excited singlet state (1PS*) which then undergoes internal conversion and changes to a triplet state (3PS*). The triplet PS reacts with either tissue substrate (Type I mechanism) to form a superoxide anion radicals or with molecular oxygen to form a reactive oxygen species (Type II mechanism)

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