Figure 1 (IMAGE) Tohoku University Caption An N-terminal specific three-component [3+2] cycloaddition proceeds without affecting the highly reactive lysine residues. This reaction has been successfully applied to polypeptides of up to 26 residues. Credit Kazuya Kanemoto et al. Usage Restrictions Reporters may use freely these materials in news coverage with appropriate credit information. License Original 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.