all native closed circular dnas examined , including the viral and intracellular forms of sv40 and polyoma dna , bacterial plasmid dnas , and the double stranded closed circular dna genome of the marine bacteriophage , pm2 , are more heterogeneous with respect to the number of superhelical turns present than are the thermal distributions observed in the limit products of the action of nicking-closing ( n-c ) enzyme on the respective dnas .
C0012924
bacterial
C0012854
dnas