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In page Leroy Hood:

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At the University of Washington in the 1990s, Hood, Alan Blanchard, and others developed ink-jet DNA synthesis technology for creating DNA microarrays.[41][42] By 2004, their ink-jet DNA synthesizer supported high-throughput identification and quantification of nucleic acids through the creation of one of the first DNA array chips, with expression levels numbering tens of thousands of genes.[43][44] Array analysis has become a standard technique for molecular biologists who wish to monitor gene expression.[44] DNA ink-jet printer technology has had a significant impact on genomics, biology, and medicine.[45][46][47]