In 1990, scientists begin a special project. They want to map the whole human genome. The human genome is the genetic information in a human body.

Scientists from many countries work on the project. They are, for example, from the United States, United Kingdom, Japan, France, Germany, and China.

On April 14, 2003, the scientists say that they know the human genome.

The genome has 3 billion DNA pairs.

This success of the project is important for medicine and biology.