I remember reading about a study that supposedly found brain scan-based diagnostic criteria for gender dysphoria, which would have given some evidence to claims that brains show the identified gender and trans is real, yada yada yada.
There was a huge wave of protest on Twitter from TRAs and the authors renounced publishing the study. It wasn't even retracted after critical overview, just plain censored. It was a couple years ago, probably 2021 or 2022.
If anyone remembers the name of the authors I'd greatly appreciate it!