DNA  (Sanger)  sequencing  using
   dideoxy chain termination.
<Li> A primer is annealed to the target template DNA.
<Li> A   mixture   with   DNA  polymerase,  the  four  dNTPs,  and  one
dideoxynucleotide (such as ddATP), is added.
<Li> During  primer  extension,  the  polymerase occasionally inserts a
ddNTP  instead  of  a dNTP, which lacks the 3'-OH needed to attach
the next nucleotide, terminating the chain.
<Li> Gel  electrophoresis  separates  the  synthesized  fragments  that
terminate at the dideoxynucleotide.