Researchers at the Francis Crick Institute have shed light on the proteins controlling the development of ovaries in mice before and after birth. This could lead to a better understanding of how ...

The endocrine system comprises glands and tissues that produce and secrete hormones to regulate and coordinate vital functions of the human body. This article â the seventh in an eight-part series on ...

Our gender is identical to our sex, written in our genes, can be clearly assigned and does not change over our lifetime. The woman on one side, the man on the other ― you're either a princess or a ...

This article was reviewed by Felix Gussone, MD. What Is Testosterone? As the primary male hormone, or androgen, testosterone ...

The human brain may have steadily grown in size not because evolution plucked some big-brained ancestors out of the crowd, favoring their smarts over others, but because energy allocated to growing ...

When Pidgeon Pagonis was born in a Chicago hospital 37 years ago, her doctors saw something that alarmed them. "I was born looking female on the outside," Pagonis said, "and then it was discovered ...