Professor Sir Alec Jeffreys, who invented the technique of DNA fingerprinting, has announced his retirement.
The technique of DNA finger printing has transformed forensic science and identity testing. It was developed by Professor Jeffreys at the University of Leicester back in 1984. It has since been used in criminal investigations, paternity and immigration disputes, and even conservation biology.
Although all human beings have the same basic DNA, there are minor variations in their sequencing which means it is possible to tell if two samples of DNA are from the same person.
Just a year after the discovery, the first immigration and paternity cases were solved using the technique, and the first identification of identical twins took place.
People who have benefitted from his research have paid tribute to him: