How to grow a burger in the lab
5 August 2013 Last updated at 00:34 BST
Researchers will unveil the world's first lab-grown burger in London later today. It has been grown from stem cells taken from a dead cow.
BBC News has had exclusive access to the laboratory in the Netherlands, where the artificial meat was produced.
Here, Prof Mark Post of Maastricht University who led the research, explains how the burger was made and reveals the freezers full of ingredients.