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Immunostaining of a white blood cell (A) and a circulating tumor cell (B) in peripheral blood for the following markers: (a) DAPI, (b) CD45, (c) CK9, (d) EpCAM, (e) DAPI+CD45+CK9, and (f) DAPI+CD45+EpCAM. The bar represents 10 μm. DAPI = 4′, 6-diamidino-2-phenylindole, CD45 = cluster of differentiation 45, CK9 = cytokeratin 9, EpCAM = epithelial cell adhesion molecule.
