What are germ cell and sex cord stromal cells? Germ cells and sex cord stromal cells form when a fetus (baby) is developing. A fetus is made from a sperm cell and an egg cell. Germ cell tumors (GCTs) ...

The awe-inspiring process of cell division can turn a fertilized egg into a baby -- or a cancerous cell into a malignant tumor. With so much at stake, nature keeps it tightly controlled in a process ...