Then, in the mid-1990s, he injected the vaccine into mice with tumors containing the mutant gene.

FORBES: Magazine Article

He located the mutant gene responsible for this monstrosity on one of the fly's chromosomes.

ECONOMIST: Genetic science

You must have had a mutant gene somewhere in the DNA, because all the lifting had turned you into a goddam circus freak.

NEWYORKER: Miss Lora

Scientists believe that patients with this mutant ATM gene may have a more aggressive form of CLL which is more difficult to treat with conventional drugs.

BBC: Gene research

Studying these creatures, Dr Zoghbi saw that the rodents with a mutant form of the gene were affected similarly to people: they developed tremors and spasticity in their forelimbs, became susceptible to seizures and suffered breathing problems.

ECONOMIST: Neuroscience (1)

Patients with a mutant version of the PPAR gamma gene have a 25% higher risk of developing adult-onset diabetes, in which cells stop responding to insulin's orders.

FORBES: Silencing "Syndrome X"

When geneticists replaced one of the mutant fly genes by its homologous mouse gene the fly developed normal flies' eyes and not mouse eyes.

ECONOMIST: Genetic science

By patching in a plant gene, they have created a mutant strain that can make an enzyme which converts a natural amino acid called tyrosine into one of the synthetic forms.

ECONOMIST: Chemists are trying to synthesise new varieties of life