Genetics is about storing and passing on messages. Genetic messages are stored in your DNA, which is inside almost every cell in your body. DNA tells cells what they're supposed to do, when, where and how - to keep your body working well.

Scientists are working to understand the genetic messages that make some people respond to medicines differently than others and make some people more prone to certain diseases than others. They use this knowledge to make new medicines to help people live healthier lives.