Acentric Chromosome (IMAGE) University of California - Santa Cruz Caption In this dividing cell, chromosome fragments (red) remain in the middle of the green spindle structure, while the rest of the chromosomes have segregated to the two poles. Fragments that fail to segregate to daughter nuclei form micronuclei, resulting in an unstable genome and cancer. Credit Travis Karg Usage Restrictions For use only with news coverage of this research 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.