Table 1.

Nomenclatures of RNAs used in this work

Name	Sequence
SDR1a	5′ A1 UC, ACC, UCC, UUA12
bSDR1b	5′ biotin-AUC, ACC, UCC, UUA
bSDR1su7c	5′ biotin-AUC, ACC, sU7CC, UUA
SDR2a	5′ U13AA, GGA, GGU, GAU24
bSDR2b	5′ biotin-UAA, GGA, GGU, GAU
SDR2-u18d	5′ UAA, GGu, GGU, GAU

^aSee Fig. 1A for the numbering scheme.

^bBiotin attached to the 5′ phosphate via a (CH₂)₆ linker during chemical synthesis.

^csU = 4-thio-uridine.

^dAn adenine to uridine mutation (lower case letter) introduced at the 18^th position.