A protein called COUP-TFII determines whether a mouse embryo develops a male reproductive tract, according to new research. The discovery changes the long-standing belief that an embryo will ...

It’s not just about chromosomes. Or reproductive cells. Or any other binary metric. Many genetic, environmental and developmental variations can produce what are thought of as masculine and feminine ...

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), which was first discovered in patients with severe pneumonia at the end of 2019, has since infected over 272 million worldwide and ...

People tend to shy away from this question. The answer is often murky, and different people will have their own definitions of sex and gender. It’s about as simple as comparing an apple and a car. Sex ...