Maternal Genes Shape Development (IMAGE) Princeton University Caption An organ called Kupffer's vesicle, which helps specify the left and right sides of the developing fish, is shaped asymmetrically in a wild-type embryo (left), but is more symmetric in the absence of maternally inherited gdf3 (right). Credit Pelliccia et al., 2017 Usage Restrictions Pelliccia et al., 2017 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.