Molecular biology is one of the most rapidly growing develo- ping and at thesame time most exciting disciplines. The key to molecular biology lies in the understanding of nucleic a- cids - their structure, function, and interaction with pro- teins. Nucleic Acids and Molecular Biology keeps scientists informed of the explosively growing information and complies with with the great interest in this field by offering a continued high standard of review. A substantial part of this volume has been devoted to the analysis of different aspects of nucleic acid-protein-interactions including RNA- protein- interaction.