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Clockwise, from top left: 1) Electron density in the P4-P6 domain of Tetrahymena Group I Intron Ribozyme (J. Cate, J. Doudna, C. Kundrot, A. Gooding, ); 2) NMR structure of RNA leadzyme (P. Legault & ); 3) X-ray structure of the lysine riboswitch (A. Garst & ); 4) NMR structure of theophylline-binding RNA (G. Zimmerman & ); 5) NMR structure of the GA3 RNA tetraloop (F. Jucker & ) 6) Nucleosome structural elements (K. Luger et al) 7)  Structure of a complex between the specific RNA binding domain of a bacterial DEAD-box helicase and its target RNA (J.W Hardin, Y.X. Hu, D.B. McKay) 8) Images of nucleosome structure (K. Luger et al) 9) Structure of human POT1 bound to telomeric single-stranded DNA (M. Lei, E.R. Podell, T.R. Cech)