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  #6,534,266
Assay of gene expression patterns by multi-fluor fish.
inventor: Robert H Singer
Filed on April 21, 2000, awarded on March 18, 2003.

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An in situ hybridization method for detecting and specifically identifying transcription of a multiplicity of different target sequences in a cell is disclosed. The method includes assigning a different bar code to at least five target sequences, with each target sequence containing at least one predetermined subsequence. Each bar code contains at least one fluorochrome, and at least one bar code comprises at least two different, spectrally distinguishable fluorochromes. A probe set specific for each target sequence is provided in the method. Each probe set contains a hybridization probe complementary to each subsequence in the target sequence. Each probe is labeled with a fluorochrome, and the fluorochromes in each probe set collectively correspond to the bar code for the target sequence of that probe set.
 
 
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