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(A) The 29 nt model system (AM1A) of the antiterminator used in the binding and structural studies. (B) Original antiterminator model RNA (AM1) and the corresponding S1/V1 enzymatic cleavage results. RNase S1 cutting in single-stranded regions is designated with a solid arrow, while RNase V1 cutting in double-stranded or stacked regions is designated by a dashed arrow.
