observation of the replicative behavior of one viral dna in the presence of another was made possible by the use of two different mutants with distinguishable dnas : a viable deletion mutant containing dna insensitive to taqi restriction enzyme was used to provide viral functions required for replication , and a tsa mutant with taqi-sensitive dna was introduced at various times as a probe to determine the ability of the dna to replicate under different conditions .
C0012939
viral dna
C0012854
dna