using cloned ( dg-da ) n x ( dc-dt ) n dna duplexes [ ga ) n ) as models of homopurine-homopyrimidine s1-hypersensitive sites , we show that cleavage of the alternate ( non-b , non-z ) dna structure by s1 nuclease is length-dependent , in both supercoiled and linear forms , which are similar because of the identity of their nicking profiles .
C0012854
dna
C0043442
z