| RNase-free water | 47 μL |
| T4 RNA Ligase Buffer, 10× | 8 μL |
| BSA (1mg/mL) | 8 μL |
| 10 mM ATP | 8 μL |
| 32P-labeled RL3 linker (prepared as in Box 1) | 5 μL |
| T4 RNA Ligase I | 2 μL |
| Optional: RNAsin Plus (Promega). | 2 μL |
| RNase-free water | 47 μL |
| T4 RNA Ligase Buffer, 10× | 8 μL |
| BSA (1mg/mL) | 8 μL |
| 10 mM ATP | 8 μL |
| 32P-labeled RL3 linker (prepared as in Box 1) | 5 μL |
| T4 RNA Ligase I | 2 μL |
| Optional: RNAsin Plus (Promega). | 2 μL |