The PCC report therefore concluded the offers of money were justified because it was in the public interest to know more about Ms Gehring's behaviour.

BBC: Gehring witness payments 'justified'

Mr Gehring has evidence that the two interchangeable genes act as master switches which activate at least 2, 500 others whose interplay ultimately determines that development.

ECONOMIST: Genetic science

In 1965 a Swiss graduate student, Walter Gehring, discovered a fly which had grown legs on its head in the place where it should have had antennae.

ECONOMIST: Genetic science