Microscopic Images (IMAGE) Proceedings of the National Academy of Sciences Caption Microscopic images of deltamethrin Form I (left) and Form II (right). Credit Image credit: Jingxiang Yang Usage Restrictions None 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.