''We think that these genetic differences might reduce testosterone action and under masculinise the brain during foetal development.... There is a social stigma that transsexualism is simply a lifestyle choice, however our findings support a biological basis of how gender identity develops.''

Lauren Hare, a researcher associated with an Australian genetics study of 112 male-to-female transgender volunteers that concludes that they "were more likely to have a longer version of the androgen receptor gene.'' (BBC)