when t7 dna damaged by uv irradiation was treated with an endonuclease from micrococcus luteus that is specific for pyrimidine dimers and then was incubated with an extract of uninfected e. coli capable of removing pyrimidine dimers and restoring the dna of its original ( whole genome size ) molecular weight , this dna showed a higher packaging efficiency than untreated dna , thus demonstrating that the in vitro repair system partially restored the biological activity of uv-damaged dna .
C0012854
dna
C0000702
a