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Secondary structures of the 3′ ends of tRNA
(a) Asn-AAC; (b) Pro-CCA; (c) Ser-TCG; (d) Thr-ACC; (e) Tyr-TAC; (f) Cys-TGC. The letters in front of a hyphen stand for the amino acid carried by tRNA, and the letters behind a hyphen stand for the codon corresponding to tRNA. The segment between two arrows is identical with the direct repeat
