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Contains 15% Ficoll 400, 0.25% bromophenol blue, and 0.25% xylene cyanol in TE Buffer pH 8.0. The bromophenol blue and xylene cyanol dyes are used for tracking migration during electrophoresis. In 0.5 - 1.2% agarose gels using 0.5x TBE bromophenol blue migrates at approximately 300bp and xylene cyanol at approximately 4kb.