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Putative tRNA structures and predicted cleavage sites. The predicted secondary structures of tRNA Ile_cluster0, tRNA Arg_cluster0, tRNA Thr_cluster1 and tRNA Arg_cluster7 are shown. The color code depicts base pair probabilities. Black arrows show 5′ cleavage sites determined by sRNA sequencing while cleavage sites suggested from Northern hybridizations are shown by red arrows for 5′ tRFs, internal (I) tRFs or 3′ tRFs. The lengths of 3′ tRFs are calculated excluding the 3′ CCA.
