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Histochemical Detection of Lipid Droplets in Cultured Cells

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Cells store excess lipid as esters in the form of triglycerides and cholesterol esters. Most lipid esters are compartmentalized in globular structures called lipid droplets. Here we describe several methods of detecting lipid droplets by fluorescence microscopy. Lipid droplets can be visualized either by staining the lipid ester core using fluorescent dyes or by labeling lipid droplet-specific proteins using antibodies. The intracellular distribution of lipid droplets can be analyzed without much difficulty by these methods, but care must be taken to avoid certain pitfalls.
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