An embryo expressing a PIP3 marker. (IMAGE) Whitehead Institute for Biomedical Research Caption An embryo expressing a PIP3 marker. Credit Credit: Lehmann Lab/Whitehead Institute Usage Restrictions None 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.