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What is a DNA microarray?

What is a DNA microarray? Here are some definitions.

Noun
  1. A collection of microscopic DNA spots attached to a solid surface forming an array; used to measure the expression levels of large numbers of genes simultaneously.
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Examples
A progress report on the development of DNA extraction methodologies and preliminary DNA microarray results on characterizing biotechnology products is currently under preparation.
FishPopTrace, a European consortium, has developed a DNA microarray that can track which population a fish comes from.
A DNA chip, or DNA microarray, is a small glass slide that can reveal the presence or absence of particular DNA sequences in a sample.
Advances in other fields such as antibody-based detection methods, gene probes, microfluidics, genomics and DNA microarray techniques are also leading to new approaches for assessing microbial water quality.
The goal of one of his projects is to develop a statistical approach that would allow an optimal analysis of DNA microarray data when dealing with a small number of replicates.
In the past decade DNA microarray technology has made it possible to measure the expression levels of many thousands of genes simultaneously in a single experiment.

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