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The ring-shaped RNA chaperone Hfq has recently received much attention owing to its multiple roles in RNA metabolism. In this study we have performed a mutational analysis of the Escherichia coli hfq gene, and have studied the effects of amino acid substitutions at several positions in the Hfq protein as well as of C-terminal truncations on its role in phage Qβ replication, in repression of a target...