Pea Aphids (IMAGE) Emory Health Sciences Caption Pea aphids, expert survivors of the insect world, appear to lack major biological defenses, according to the first genetic analysis of their immune system. Credit Nicole Gerardo, www.emory.edu/esciencecommons Usage Restrictions Please include full credit 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.