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Details of base pairing for the first, second and third positions of the ΨAG/ASL-tRNASer structure with the ribosomal bases involved in minor groove recognition are shown on the left. For comparison, the corresponding positions of the codon-anticodon base pairs of a phenylalanine UUU codon with its cognate ASL anticodon from a previous study2 are shown on the right.
