It's purpose is to prevent tumors. In half the people who get cancer, this gene has something wrong with it. This may also happen with zebra fish. So by studying the p53 gene in zebra fish, scientists can learn more about cancer in humans. Blood is an important part of our body.
Newborn babies have about one third of a litre of blood.
Grownups have between four and five litres. Each part has its own job. Red blood cells carry oxygen and food to all the parts of our body. They also give blood its color. White blood cells fight infections.