killifish embryos (IMAGE) University of Basel Caption Killifish embryos under a fluorescence microscope. Left with a developed axis, right without formation of the axis. The cells remain dispersed. Credit Biozentrum, University of Basel Usage Restrictions Only to be used in reporting on the related press release 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.