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(A) Long SUP4 pre-tRNAArchEuka Tyr. After processing by RNase P and splicing of the BHB-containing intron, this long precursor produces a bona fide SUP4 tRNATyr. (B) Long SUP4 pre-tRNATyr. This precursor is like the one in panel A except that the intron does not contain the BHB. (C) Schematic structure of the gene encoding the long tRNA precursor.
