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        Absolute Quantitation of 2-D Protein Spots

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        Proteome analysis has been revolutionized by the marriage of two-dimensional (2-D) gel electrophoresis and mass spectrometry (1 4 ). Mass spectrometry in combination with database searching permits the large-scale identification of proteins, and 2-D gel electrophoresis allows for the large-scale visualization and separation of cellular proteins. Previously, spot quantitation has been difficult, and numbers obtained were usually comparative, but not absolute (5 7 ). Mass spectrometry and 2-D gel electrophoresis in tandem can be used to quantitate protein spots. This chapter covers protocols to quantitate precisely the relative amounts of protein observed in the 2-D gels using radiolabeled total cell extracts.
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