Yu Okamura (IMAGE) Max Planck Institute for Chemical Ecology Caption Yu Okamura with mating cabbage white butterflies (Pieris brassicae). The larvae of butterfly lines that no longer had either of the two detoxification enzymes after CRISPR-Cas9 genome editing were unable to properly defuse the host plant mustard oil bomb. Their growth and survival was severely impaired. Credit Yawako Kawaguchi Usage Restrictions Credit must be given to the creator. Adaptations must be shared under the same terms. License CC BY-SA 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.