Artistic rendering of confocal micrograph (IMAGE) Hubrecht Institute Caption zebrafish notochord nuclei at 15-somite stage. Grey: nuclear DNA (DAPI). Color: histone H3K9me3 Credit Phong Nguyen, Franka Rang & Kim de Luca. Copryight Hubrecht Institute. Usage Restrictions Only with appropriate credit and caption 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.