A DNA microarray is a thin-sized chip that has been spotted at fixed locations with thousands of single-stranded DNA fragments corresponding to various genes of interest. A single microarray may contain 10,000 or more spots, each containing pieces of DNA from a different gene. A single gene chip can even hold representative fragments from the entire human genome.
![Finding Genes With Microarrays (cont.)](https://webarchive.library.unt.edu/eot2008/20090131033839im_/http://www.nci.nih.gov/images/Documents/abd6d05e-f179-4ec1-8376-6d4992583274/cancer12.jpg)
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