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The peroxidase-mediated deposition of hapten- and fluorochrome-labeled tyramides has recently been shown to increase the sensitivity of immunofluorescence and fluorescence in situ hybridization techniques. We have evaluated a number of red, green, and blue fluorescent tyramides for detection of antigens in tissue sections and cytospin preparations and for the detection of hapten- and horseradish peroxidase-labeled probes hybridized in situ to cells and chromosomes. With few exceptions, all fluorescent tyramide-based methods provided a considerable increase in sensitivity compared to conventional immunofluorescence and FISH methods.

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