Robert Reid reports.
The story of how physicists, chemists, and biologists have combined forces to produce the biggest biological break-through in the last fifty years-the discovery of the chemical believed to be the basis of heredity.
As told by some of those who have taken part in the research with the help of outside broadcasts and film.
From Cambridge, Dr. Daniel Brown and Dr. Vernon Ingram
From New York, Dr. L.D. Hamilton
From London, Dr. Maurice Wilkins
From Paris, Dr. Harriett Ephrussi-Taylor
In the London studio: Professor Sir Alexander Todd
Programme linking by Professor C.H. Waddington