Conserved Nuclear Protein Ndc1 (image) Stowers Institute for Medical Research Caption The conserved nuclear protein Ndc1 controls the insertion of holes into the nuclear membrane (shown in bluish purple). These openings become the sites for two essential structures: passageways called nuclear pore complexes (shown in purple), and spindle pole bodies (shown in green and blue), which anchor the microtubules (shown in yellow) that pull chromosomes to opposite sides of a dividing cell. The nucleoplasm is shown in dark green and the cytoplasm in grey. Credit Image: Courtesy of Christine Smoyer, Stowers Institute for Medical Research Usage Restrictions None 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.