Without DNA recombination and mutation, humans would all be the same, says the University of Leicester's Alec Jeffreys. Jeffreys — who invented DNA fingerprinting in the 1980s — and his team have recently discovered the gene they think is responsible for DNA recombination, writes the New Scientist's Andy Coghlan. The gene, called PR domain-containing 9, makes an enzyme that locks onto DNA and recombines it when sperm eggs develop from germ cells, Coghlan says.