PtK2 Cell Microtubules and Nucleus
A vivid contrast between nuclear and cytoplasmic structure is evidenced by staining cell cultures with a combination of propidium diiodide (PI) and FITC. In the photomicrograph below, note the bright orange nucleus (stained with propidium) superimposed on a network of green filamentous microtubules stretching throughout the cytoplasm.
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