Chromosomes in Cell Mitosis (IMAGE) University of California - San Diego Caption A human cell is featured during mitosis with its chromosomes (gray areas) aligned. The region known as the kinetochore (colored with yellow, red and cyan markers) is the origin of the checkpoint signal that acts as a safety check against premature cell division and is the focus of UC San Diego researchers' study. Credit Desai Lab, UC San Diego Usage Restrictions Must be used in conjunction with Science paper on cell division. 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.