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The cloverleaf (A) and L-shape (B) representations of the wild-type M. jannaschii tRNATyr, which belongs to class I tRNA. The nucleotides are all indicated in unmodified forms, and the invariant T54 and ψ55 are shown as U. The invariant nucleotides mentioned in the text are indicated in gray boxes, and the tertiary base pairs between them are represented by broken lines (A) or the extension of the gray boxes (B). Nucleotides are numbered by the standard system.
