 Transgender brain studies, especially those on trans women who are sexually attracted to women (gynephilic), and those on trans men who are sexually attracted to men (androphilic), are limited, as they include a small number of tested individuals.The available research indicates that the brain structure of androphilic trans women with early-onset gender dysphoria is similar to the brain structure of cisgender women's and unlike cisgender men's.It also reports that both androphilic trans women and trans women with late-onset gender dysphoria who are gynephilic have different brain phenotypes, and that gynephilic trans women differ from both cisgender male and female controls in non-dimorphic brain areas.