fast sedimenting , double-stranded , covalent circular lambda phage dna in superinfected lysogens of escherichia coli is converted to notched circular dna , sedimenting slowly in alkaline sucrose gradients , by methylmethane sulfonate ( mms ) treatment during incubation at 37 degrees . during further incubation after removal of the mms , the slow sedimenting dna reverts to the fast sedimenting structure .
C0012925
circular dna
C0012854
dna