Definition: microarray technology

A new way of studying how large numbers of genes
interact with each other and how a cell's
regulatory networks control vast batteries of
genes simultaneously. The method uses a robot to
precisely apply tiny droplets containing
functional DNA to glass slides. Researchers then
attach fluorescent labels to DNA from the cell
they are studying. The labeled probes are allowed
to bind to complementary DNA strands on the
slides. The slides are put into a scanning
microscope that can measure the brightness of each
fluorescent dot; brightness reveals how much of a
specific DNA fragment is present, an indicator of
how active it is.

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