1. Resuspend cDNA in 27 |L ddH2O. An example reaction is the following:
5 |L 10X ligase buffer;
2 |L T4 RNA ligase—12-18 U (see Note 6). Incubate for 1 h at room temperature then 14°C overnight.
2. Heat-kill the enzyme at 80°C for 15 min, and then cool on ice.
3. Remove 1 ||L of the ligation mix to test for ligation (see Note 7).
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