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Type II photosensitization cross-linking of Ras. Proposed mechanism of nonspecific cross-linking reaction involves the dye photosensitizer cycling between the ground (S0) and triplet states (T*). The energy transfers to molecular oxygen (O2), which becomes excited to the singlet state (1O2). This ROS reacts with Ras, which forms a free radical species and cross-links with another Ras.
