Genes in Flies Control Meal Size (IMAGE) California Institute of Technology Caption The two flies to the left are normal flies exposed to food mixed with red dye after 24-hour starvation; the two flies to the right are leucokinin mutants tested at the same conditions. Credit Bader Al-Anzi/Caltech 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.