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The process starts by attaching a fluorescent dye to the DNA strand of interest. Then, the laser light outfitted in the DNA sequencer emits at a wavelength that is absorbed by the fluorescent dye attached to the sample DNA. Afterward, one or more optical detectors are used to detect the wavelength that the dye fluoresces at. The output of the detector gives the reading. However, the output of these machines is not perfect as it may contain reading errors and needs to be processed.