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Irradiation of mixtures of a single-stranded circular plasmid and of a
double-stranded supercoiled DNA in presence of the cyclobisintercalan
d compounds 2 or 3 shows that these reagents effect the selective phot
ocleavage of the single-stranded entity. Furthermore, 2 also cleaves t
RNAasp preferentially at single stranded domains. (C) 1998 Elsevier Sc
ience Ltd. All rights reserved.