A sculpture of the double helix structure of DNA is being unveiled by one of the two scientists who revealed it to the world.
Professor James D Watson donated the sculpture to Clare College, Cambridge University, on Wednesday.
As students at Cambridge, he and Francis Crick made the 1953 breakthrough which was to unlock the key of life.
The aluminium sculpture is by the American artist Charles Jencks.
Master of Clare College, Tony Badger, said: "We are both pleased and honoured that James Watson has donated this magnificent sculpture, and that he has been able to return to the college for this unveiling.
"It is wonderful to have this lasting reminder of his achievements while he was at Clare and the enormous contribution he and Francis Crick have made to our understanding of life on earth."
The two scientists were awarded a joint Nobel Prize for their discovery in 1962.
Northampton-born Professor Crick died in July 2004 aged 88.
Professor Watson is now chancellor and former president of Cold Spring Harbour Laboratory in the USA.