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Secondary structures of the oligonucleotides used in this study. 1 is the 4×3 nucleotide asymmetric internal loop library, where N represents an equimolar mixture of A, C, G, and U. RNA 2 is an oligonucleotide mimic of the bacterial A-site. Oligonucleotides 3-9 are used to compete off interactions to the regions in 1 that are common to all library members.
