Automated DNA sequencing is now common place which is based on the chain termination method but using a fluorescent dye attached to an oligonucleotide primer instead of using radioactive labeling. A several fluorescent dye is attached to the primer for every of the four sequencing reactions but, follow incubation, all four combinations are electrophoresed and combined on one gel lane. An laser detection systems then distinguish the self of every termination product as it elutes from the gel. The sequence in that the several fluorescent products elute from the gel gives the DNA sequence.