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(A) SUP4 pre-tRNATyr. This tRNA precursor carries a mutation in the anticodon that enables it to suppress nonsense mutations of the ochre type (UAA). (B) SUP4 pre-tRNAArchEuka Tyr. An archaeal-type intron of 17 nt forming a BHB structure has been inserted in the anticodon stem-and-loop region of SUP4 pre-tRNATyr.
