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        Analysis of Protein Distribution in Cartilage Using Immunofluorescence and Laser Confocal Scanning Microscopy

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        Protein localization in cartilage sections by antibodies that specifically bind to epitopes of a protein is one of the most powerful technologies in modern cartilage research. Studies using two or more primary antibodies that recognize different protein epitopes allow the colocalization of different gene products in one cartilage section. In addition, specific histochemical stains help to visualize nuclear DNA, mitochondria, and other subcellular compartments. By these immunohistological methods, the distribution of proteins can be analyzed throughout different zones of articular cartilage. In particular, with the use of laser scanning confocal microscopy, subcellular localization of proteins can also be determined (i.e, nuclear, cytoplasmic, membrane-associated, and extracellular). Overall, immunohistochemical methods are fairly simple to handle, and the reagents required are inexpensive, with the exception of basic technical equipment (fluorescence microscope or confocal microscope). However, as with many methodologies, technical knowledge and experience is important to avoid and/or interpret either false-positive or false-negative results.
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