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Illustration of cells isolated from peripheral blood by immunomagnetic cell selection and analyzed with a fluorescent microscope. Cells that stain positive for 4′,6-diamidino-2-phenylindole (DAPI; nuclear stain), positive for CK19 (epithelial cell), and negative for CD45 (lymphocyte) are identified as a circulating tumor cells. Cells that stain positive for CD45 are identified as lymphocytes.
