. . . "The dual-labeled fluorescein/Cy5 probe Cy5-CTGCCG-F-TACTGCCCTGTGGG GCAAGGp (SEQ ID NO:19) was synthesized by standard phosphoramidite chemistry, where p is a terminal 3???-phosphate (chemical phosphorylation reagent, Glen Research), F is a fluorescein residue introduced as an amidite with a 2-aminobutyl-1,3-propanediol backbone to maintain the natural 3-carbon internucleotide phosphodiester distan" .