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Sequence of Kt-7 and the RNA species used for crystallization. (A) The sequence of H. marismortui Kt-7, with key nucleotides labeled using our standard nomenclature (Liu and Lilley 2007). (B) A stem–loop RNA containing a single Kt-7 sequence. This was used for the crystallization of the complex of A. fulgidus L7Ae bound to Kt-7. (C) A duplex RNA containing two Kt-7 sequences with twofold rotational symmetry. This was crystallized in the absence of protein.
