Polikanov-Syroegin paper image (IMAGE) University of Illinois Chicago Caption Illustration showing the principle of native chemical ligation approach developed by Syroegin, et al. Addition of the cysteine amino acid (red) to tRNA (blue, top left) allows for the tRNA to fuse to a peptide (yellow, lower left). The resulting ribosome structure (middle) and the captured electron density maps for the peptidyl-tRNA inside the ribosome (right) were obtained by X-ray crystallography in the UIC experiments. Credit Syroegin, et al. Usage Restrictions none 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.