An enzyme with a smart friend (IMAGE) European Molecular Biology Laboratory Caption A previously unheard-of cooperation between two enzymes helps the cell to construct new proteins with more precision. The tRNA modification enzyme METTL6 (in orange) cooperates with the serine tRNA synthetase (in shades of lilac) to select serine tRNAs (black ribbon) from the cellular pool of tRNAs – molecular ‘delivery trucks’ carrying protein building blocks Credit Isabel Romero Calvo/EMBL Usage Restrictions Credit must be given to the creator. Adaptations must be shared under the same terms. License CC BY-SA 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.