Nucleolinus, Surf Clam Egg (Lasered) (IMAGE) Marine Biological Laboratory Caption Left: This is a Spisula surf clam egg cell. The nucleolinus (arrowhead) is within the nucleolus (arrow), and both are contained in the nucleus (GV). Middle: When the nucleolus is damaged with a laser, normal cell division takes place. Right: When the nucleolinus is damaged with a laser, cell division structures (blue and yellow) appear as a disorganized cluster, and cell division fails. Credit Mary Anne Alliegro, Marine Biological Laboratory Usage Restrictions Please use with proper credit. 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.