this duplex stem is shown to lie at the ends of the dna by using several reference markers : ( i ) a newly discovered secondary structure feature ( a loop of length ca . 500 nucleotides with a 20-nucleotide pair duplex stem ) that maps 73 % of the full length from the left end of the molecule and ( ii ) a duplex region due to a hybridized restriction fragment .
C1521970
feature
C1444754
length