"Our results showed that among identical twins, if one was trans, the likelihood that the other was also trans was 21.2%."
Yet more evidence of a strong genetic link to being trans.
We shouldn't need to rely on studies like this to be considered valid, but sadly we often must.
theconversation.com
Critics claim trans people ‘defy biology’. New research suggests otherwise
A new study in twins shows the likelihood of being trans is influenced by your genes.