Just in from Austrarlia's Prince Henry's Institute where the nature versus nurture debate rages on but a new study of transsexuals has shown genetics plays a key role in determining our sense of gender.
In the largest genetic study of its kind, 112 male-to-female transsexuals took part in a study involving several Melbourne research bodies and the University of California, Los Angeles.
Researchers measured the variation in the androgen receptor gene, which is involved in the functioning of the sex hormone testosterone.
DNA samples from the transsexuals were compared with the samples from 250 typical men.
Researchers discovered the transsexuals were more likely than non-transsexuals to have a longer form of the gene.