I have posted this before and got flame for it. It is what it is, emerging research that points to the biological underpinning of the area(s) of the brain that determines your gender. Just like in the body are many anatomical and physiological sexual dimorphism, e.g breast, hip, bossing, hair distribution, liver metabolism, etc. So there are many areas in the human brain that are anatomically and/or physiologically sexually dimorphic, e.g, corpus callosum, putamen, anterior comissure, olfactory cortex, sexual dimorphic nuclei, and the famous bed nucleus of the stria terminalis (BST).
The evidence indicates that it is the BST the master center that determines your gender. A number of gens are responsible for the maleness or femaleness development of the BST in uterus. In addition to mutation on the gene, epigenetic factors such as estrogenic substances can alter the development of the BST.If you PM, I will send you a few scientific papers on the topic. I caution you that even in this forum, there are people who refuse to believe that TG/TS is a medical condition, and prefer the esoteric explanations
Love Kate D (PR)