/lit/ - Literature

>>12289147
Animal studies show that if you expose certain animals to a certain amount of cross-sex hormones during key stages of their perinatal development they'll behave like animals of the opposite sex despite overtly looking like their "original" sex. I think that it is plausible that transsexuality is how this phenomenon expresses itself in humans.

Brain studies:
http://www.jneurosci.org/content/34/46/15466
https://www.researchgate.net/publication/321820257_Structural_connections_in_the_brain_in_relation_to_gender_identity_and_sexual_orientation

Gene studies:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3402034/

Twin/Heritability studies:
http://www.hawaii.edu/PCSS/biblio/articles/2010to2014/2013-transsexuality.html
https://www.researchgate.net/publication/323261652_The_Biological_Contributions_to_Gender_Identity_and_Gender_Diversity_Bringing_Data_to_the_Table

Animal studies:
https://www.ncbi.nlm.nih.gov/pubmed/3235069