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In the 1990s, a technique was developed to transfer proteins from electrophoresis gels onto poly(vinylidene difluoride) (PVDF) membranes, digest the proteins on the membranes with proteases such as trypsin and analyze the resulting peptides on the membranes directly by mass spectrometry to identify the proteins. This technique, based on gel electrophoresis, is particularly useful for analyzing protein...
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