Xenopus Frog Eggs (IMAGE) Stanford Medicine Caption After being scrambled, the cytoplasm of Xenopus frog eggs spontaneously reorganizes into cell-like compartments. Nuclei are blue; microtubules are green; the endoplasmic reticulum is red. Credit Xianrui Cheng Usage Restrictions Credit: Xianrui Cheng/Stanford Medicine 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.