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There have been studies done on dead transgender people that demonstrate that trans people have differing brain structures; a trans woman’s brain will have many (but not all) of the features that a cisgender woman’s brain has. The same goes for trans men.
There is no such evidence for transracial people as that’s not really a thing. Race is much more of an artificial concept than gender, and has little biological basis. Black people are not of a different race than white people, they simply have different genetic traits that are well within the boundary for counting as the same species.
Brain regions can be considered masculinized or feminized depending on their response to sex hormones (look up the preoptic area for a well-studied example of this); there’s no such thing as a ‘race hormone’ that can ‘blacken’ or ‘whiten’ brain regions.
You could have just Googled this if you just wanted an answer…
If anyone doesn’t want to give Reddit any kind of traffic, the answer is this:
source: https://brain.oxfordjournals.org/content/131/12/3132.full
race as a social construct: http://www.jstor.org/stable/188702?seq=1#page_scan_tab_contents
estrogen modulates neuronal movements within the developing preoptic area/anterior hypothalamus: https://pmc.ncbi.nlm.nih.gov/articles/PMC2295210/
The JSTOR article seems to be loginwalled. You can get access to it from here.
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There is also growing evidence to suggest transgenderism has a genetic root confirming people are born trans.