Mitotic Chromosomes (IMAGE) Universität Bayreuth Caption Immunofluorescence microscopy of mitotic chromosomes. The blue dots mark the kinetochores, which are the attachment points for the spindle fibres. Between each pair of kinetochores are the cohesin rings, which must be cut by Separase to separate the sister chromatids. The DNA is marked in yellow. Credit Picture: Susanne Hellmuth. Usage Restrictions None 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.