Ao Guo, Ph.D. (IMAGE) St. Jude Children's Research Hospital Caption Ao Guo, Ph.D., postdoctoral research associate in the St. Jude Department of Immunology and first author of the study published in Nature. Credit St. Jude Children's Research Hospital Usage Restrictions Media outlets are free to share the material. Attribution is required. 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.