(IMAGE) Champalimaud Centre for the Unknown Caption Using a unique microscopy method, scientists identify key neurons controlling protein craving during pregnancy and under nutritional restriction in fruit flies. Credit Ribeiro lab, Champalimaud Foundation. Usage Restrictions With credit only. 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.