2-4 Cell Stage (IMAGE) University of Zurich Caption The development of plant embryos (2-4 cell stage, left) in the thale cress (Arabidopsis thaliana) is predominantly governed by maternal genomic information, while later on (globular stage, right) both maternal and paternal gene expression is required to complete development. Credit Michael T. Raissig, Institute of Plant Biology, UZH 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.