You could try Tri-Link Technologies (www.trilinkbiotech.com) - they sell oligonucleotides labelled at one end with a fluorophore and at the other with a quencher, which they describe as molecular beacons. They list a reference of Nature Biotechnology 14, 303-308 (1996). Best of luck, Michael Kuhn Helix Research Co. www.helixresearch.com
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