Referring now to FIG. 3, two oligonucleotides were synthesized on an Applied Biosystems Model 380a machine with the sequence 5???-TGACGTCTCGAGTTGTNNKNNKNNKNNKNNKNNKNNKNNKTGTGGATCTAGAAGGATC-3??? (SEQ ID NO:31) and 5???-GATCCTTCTAGATCC-3??? (SEQ ID NO:32), where N is an equimolar ratio of deoxynucleotides A, C, G, and T, and K is an equimolar ratio of G and T. Fifty pmol of each oligonucleotide was