Homology and repair of UV-irradiated plasmid DNA in haemophilus influenzae.

UV-irradiated plasmid pNov1 containing a cloned fragment of chromosomal DNA could be repaired by excision, but plasmid p2265 without homology to the chromosome could not. Establishment of pNov1 was more UV resistant in Rec(-) than in Rec(+) cells.