Each sample was added with 0.4 µl of RT primer (100 µM, Supplementary Table 18) and 1 µl of dNTP mix (10 mM each), incubated at 72 °C for 3 minutes, and put on ice immediately, to anneal the RT primer to the 3′-end adapter of RNAs. After adding 11.6 µl of the RT mix (final concentration: 1× SuperScript II first-strand buffer, 10 U/µl of SuperScript II reverse transcriptase (Invitrogen, 18064-014), 1 U/µl of RNase inhibitor (TaKaRa, 2313A), 5 mM DTT (Invitrogen, 18064-014), 1 M Betaine (Sigma-Aldrich, 61962), 6 mM MgCl2 (Invitrogen, AM9530G), and 0.98 µM TSO (Supplementary Table 18)), the sample was incubated at 42 °C for 90 minutes; 10 cycles of 50 °C for 2 minutes and 42 °C for 2 minutes; 70 °C for 15 minutes; and held at 4 °C.
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