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Cover Illustration: Solution structure of helix I from the 5S ribosomal RNA of E.coli (Protein Data Bank code: 1elh; 6 models; ribbon/sticks representation). The image generated with InsightII from Accelrys, Inc. Cover image provided by IMB Jena Image Library of Biological Macromolecules (www.imb-jena.de/IMAGE.html).