Asato Kuroiwa (IMAGE) Hokkaido University Caption Asato Kuroiwa, corresponding author of this study (Photo: Asato Kuroiwa). Credit Asato Kuroiwa Usage Restrictions This image is copyrighted but may be used to report on this press release if credited as instructed. 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.