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Two-photon confocal microscopy images (600-700 nm) of tumor sections of a representative control (A) and treated animal (C). Effective excitation was at 395 nm, and the intensity scale is the same in both of the two-photon images. The samples were collected after 1 week of follow-up, i.e., when the differences seen in AFS signals were maximal. In the treated tumor samples, numerous fluorescent foci were present within the cells. B and D show corresponding HE images.
