Researchers have found that a naturally occurring protein secreted only in discrete areas of the mammalian brain may...

Researchers have found that a naturally occurring protein secreted only in discrete areas of the mammalian brain may act as a Valium-like brake on certain types of epileptic seizures. The protein known as diazepam binding inhibitor, or DBI, calms the rhythms of a key brain circuit.
 For decades, DBI has also been known to researchers under a different name: ACBP & is found in every cell of the body. However, in a very specific and very important brain circuit, DBI not only leaves the cells that made it but is — or undergoes further processing to become — a natural anti-epileptic compound.

Source: http://med.stanford.edu/ism/2013/may/huguenard.html