The world’s first lab-grown burger is to be unveiled and eaten at a news conference in London on Monday.
Scientists took cells from a cow and, at an institute in the Netherlands, turned them into strips of muscle which they combined to make a patty.
Researchers say the technology could be a sustainable way of meeting what they say is a growing demand for meat.
Critics say that eating less meat would be an easier way to tackle predicted food shortages.
BBC News has been granted exclusive access to the laboratory where the meat was grown in a project costing £215,000.
Prof Mark Post of Maastricht University, the scientist behind the burger, said: “Later today we are going to present the world’s first hamburger made in a lab from cells. We are doing that because livestock production is not good for the environment, it is not going to meet demand for the world and it is not good for animals”.