"Ribonucleases (RNases) are key factors in the control of all biological processes. These enzymes ensure maturation, degradation and quality control of all types of RNAs. Some RNases are up-regulated under stress conditions and are also involved in virulence processes of pathogenic bacteria. The RNB family of enzymes is present in all domains of life and includes RNase R, RNase II and the eukaryotic Rrp44/Dis3, Dis3L1 and Dis3L2 proteins.(...)"