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The above painting shows an image of a sequencing gel, which are produced by DNA synthesis in the presence of sequence terminators such as dideoxyribonucleotides (that are mixed with deoxyribonucleotides used for chain elongation), with the DNA fragments run on an agarose gel. The agarose gels are then imaged using a DNA intercalator, such as ethidium bromide, that allows the DNA fragments to fluoresce in the ultraviolet spectrum. This is the basis of Sanger sequencing. Advances to Sanger sequencing included use of fluorescent labeled chain terminators, which allowed for a higher throughput readout and faster results. These could also be...