Biological sex is usually described in simple binary terms: male or female. This works well for germ cells (sperm versus eggs), but for other body organs it is of little help. A new study by the Max ...

We humans love putting things in boxes. Assigning simple categories makes us feel comfortable – but all too often, biology comes along to ruin the fun. Sex is often described in simplistic, binary ...

• Only sexual organs show clear separation: In all other organs, male and female gene activity patterns overlap. • Human differences are weaker: Compared to mice, the differences are smaller and ...