Instead of promoting irreversible primer extension like the Sanger method, the reversible chain terminators method uses a cyclic method that consists of nucleotide incorporation, fluorescence imaging and cleavage. The figure below shows a modified nucleotide with a cleavable dye and reversible blocking group. Once the blocking group is removed, a new nucleotide may come in.
The steps for such a process can be outlined as follows:
There are some limitations to this method which include:
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