Eggshells (IMAGE) Kyoto University Caption The team opened a small window in eggshells and implanted ovarian tumour cells on top of the vascular membrane surrounding 10-day-old chicken embryos. Credit Izumi Mindy Takamiya 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.