As adults we continue to create new brain cells. This is good news both for future disease treatments as well as for maintaining a healthy brain as we age (so keep mentally active). Until now researchers had not been able to visualize this process.
Mirjana Maletic-Savatic, assistant professor of neurology at Stony Brook University in New York State, has developed a method utilizing a chemical marker that successfully allows scientists to see the birth of these new neurons. While the make-up of the marker remains unknown, Maletic-Savatic speculates that it is a blend of fatty acids in a lipid (fat) or lipid protein.
Link: Scientific American