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A) the recombinant tRNALys 3 expressed in E. coli, B) the hairpin encompassing PAS sequence, the double-stranded PAS (PASds) with the numbering of nucleotides in the HXB2 isolate, C) the single-stranded PAS sequence (PASss) and D) the PBS. A cartoon symbolizing the secondary structure of these RNAs is drawn next their names.
