firstly , heterologous donor dna from escherichia coli , although being processed to single-stranded dna in competent b. subtilis , does not seem to be linked to the recipient chromosome upon uv-irradiation , and secondly , the labile complex of donor and recipient dna can be stabilized by means of treatment of the lysates of transforming cells with 4 , 5 ( 1 ) , 8-trimethylpsoralen in conjuction with long-wave ultra violet light irradiation .
C0012935
single-stranded dna
C0012854
dna