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Tumor cell image of dual-imaging probe. SK-BR3 cells (a–d) show stronger near-infrared (NIR) fluorescent signals than do MDA-MB231 cells (e–h). The increased radioactivity of SK-BR3 cells (d) was also confirmed by phosphor imaging. The radioactivity of MDA-MB231 cells is weak (h). Cells are shown by phase contrast microscopy (a,e).
