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Cover Illustration: Solution structure of the P4 element from bacterial RNase P RNA (Protein Data Bank code; 1f6x; minimized average structure; ribbon/sticks representation; coloring scheme: A, red; U, magenta; G, green; C, blue). The image was generated with InsightII from Accelrys, Inc. Cover image provided by IMB Jena Library pf Biological Macromolecules (www.imb-jena.de/IMAGE.html).