mRNA Degradation Mechanism (IMAGE) European Molecular Biology Laboratory Caption The enzyme that degrades messenger RNA follows the ribosomes and stops every 3 nucleotides. Credit V.Pelechano/EMBL Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.