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Genome projects are providing vast amounts of sequence data. This raw material makes possible a completely new era of experimental approaches. Among these, DNA array technology, which allows one to assay thousands of unique nucleic acid samples simultaneously, will be important in genomic research, and the results of this research are likely to affect virtually every field of biology. DNA array technology is still in its infancy, but many have demonstrated its power by using it for such diverse applications as global monitoring of gene expression, mutation detection, and genetic mapping.