Abstract
1. UV-treated φx174 is reactivated upon infecting E. coli C treated with mitomycin C or with UV.
2. E. coli 15T-D3, which has some kind of inducible phage, can show same reactivation as observed in E. coli C. However, after induction of the phage, this ability disappered rapidly.
3. It is supposed that the UV-damage on the single stranded phage DNA is repaired after it becomes double stranded form (RF).
