the presence of colicinogenic plasmids colib-p9 and colia-ca53 in e. coli k-12 cells , wild-type with respect to repair , enhanced the survival of cells after uv irradiation and increased the frequency of uv-induced arge3 and his-4 reversions , while the presence of colv-k30 negatively affected repair and mutagenesis .
C0007634
cells
C0007620
survival