Scientists think they know cause of baldness

March 21, 2012 12:00:00 AM PDT
Scientists believe they may now know what causes men to lose their hair.

According to a new study, bald men tend to have an abnormal amount of a protein called "prostaglandin D2" on their scalps. This protein appears to block hair growth.

Researchers at the University of Pennsylvania tested the theory in mice and found those given a high level of the protein went completely bald.

Researchers say the discovery could lead to new treatments for hair loss in men. The findings appear in the journal "Science Translational Medicine".