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SPECT images (a) and tumor relative signal intensities (b) of the nude mice bearing C6 xenografted tumors after 3 days of DOX treatment at different time points post-intravenous injection of the 99mTc-duramycin-Au DENPs or 99mTc-Au DENPs. SPECT images of ex vivo tumors at 8 h post-injection (c). The white circle points to the tumor site.
