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Phenotyping and genotyping of disseminated tumor cells. (a) Three cytokeratin-positive and HER2-positive disseminated tumor cells (double staining: green (FITC), cytokeratin; red (TexasRed), HER2). (b) Genotyping of a disseminated tumor cell with DNA probes for chromosome 17 (green) and HER2 (red); HER2 is amplified.
