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We describe a rapid method for visually determining specific DNA sequences at femtomole concentrations. Liposomes, encapsulating a red dye and labeled with oligonucleotide, were used in a capillary migration-sandwich hybridization assay. Capture probe was immobilized on nitrocellulose strips, and liposomes, migrating along each strip, formed a visually discernible band in the presence of target DNA. One femtomole of synthetic target sequence could be detected in &amp;lt; 10 min. Sufficiently stringent hybridization conditions can be used to allow the discrimination of a 10% mismatch sequence from perfectly complementary DNA. A 366-base PCR product was detected at 200 fmol.

Rapid method for visual identification of specific DNA sequences based on DNA-tagged liposomes