Have you ever wondered what males each of our body's cells what it is? How do our blood, skin or muscle cells get such different abilities and shapes, and what controls this process? Stem cell scientist Thomas Graf and his team accompany us on a journey through today's research and into the cell itself. A fascinating insight into how specialized cells develop from stem cells, how each cell gets its identity and how new methods are allowing researchers to change cell's fate, transforming it from one type of cell into another.