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| No. | sequence | No. | sequence |
| U1 | 5′-(GCCAGUACGUUUCGUGCUGG)2-3′ | N1 | 5′-(GUGGGAGUGAAGAGGGUAGU)2-3′ |
| U2 | 5′-(CUAUGCUUUCCUGGCGGCGG)2 -3′ | N2 | 5′-(UCAUAAGGAAUCCUGGCUAU)2-3′ |
| U3 | 5′-(GUCAUUUCUGGUCCAUAGGG)2-3′ | N3 | 5′-(CCCACAACGAGAAGCGAGCU)2-3′ |
| U4 | 5′-(GGGAUUUGCUCCCUGCUGCA)2-3′ | N4 | 5′-(CACGAGAUGGACGAACCAAG)2-3′ |
U1–U4 contain UUU triplets, and N1–N4 have no UUU triplets.
