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Adenocarcinoma cells of the lung from the same patient stained with hematoxylin/eosin (HE) or an antibody against thymidylate synthase (TS) on a 4-μm section of the formalin-fixed paraffin-embedded primary tumor. A, HE staining. B, TS staining. Magnification 1:1000 (using an oil immersion objective).
