Flexi Says: Cell division is just one of several stages that a cell goes through during its lifetime. The cell cycle is a repeating series of events that include growth, DNA synthesis, and cell division. Cancer is a disease that occurs when the cell cycle is no longer regulated. This may happen because a cell’s DNA becomes damaged. Damage can occur due to exposure to hazards such as radiation or toxic chemicals. Cancerous cells generally divide much faster than normal cells. They may form a mass of abnormal cells called a tumor. Sir Paul M. Nurse is trying to understand how certain genes that control the growth of the cell operate and what exactly happens that leads to cell damage causing uncontrollable cell growth leading to cancer. This work will help in finding the drugs that can block the damage to the uncontrollable growth of cells.