phi x174 viral strand circular dna can be synthesized in vitro from phi x174 replicative form i ( rfi ) dna in the presence of the phi x a protein , the escherichia coli dna polymerase iii elongation system , the e. coli rep helicase , and the e. coli single-stranded dna binding protein .
C0012939
viral
C0012854
dna