What is automated DNA sequencer. What is its working principle

dear nihala 
the friedrick sanger method of dna sequencing using automated dna sequencer is based on the principle of selective incorporation of the chain – elongating inhibitors of dna polymerase . via enzyme dna polymerase during in vitro replication of dna . 
dna sequencer is automated scientific instrument in which dna sequencing occur autometically . 
the device used to determine the order of nitrogen bases . 

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