To confirm and identify miRNA-directed cleavage sites on target genes, total RNA isolations from root and bud in A. donax were performed as formerly described34 (link). 5′ RACE System for Rapid Amplification of cDNA Ends, Version 2.0 kit (Invitrogen) was used for 5′ race experiments according to manufacturer’s instructions. The PCR products amplified using second nested primers were gel purified, cloned into pGEM-T (Promega) and sequenced. All primers used are listed in Supplementary Table 1.
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