For more than a century, maps of the brain have been based on how brain tissue looks under the microscope. These anatomical maps divide the brain into regions according to structural variations in the tissue. But do these divisions really reflect how the brain works? A new study on mice from Karolinska Institutet, published in Nature Neuroscience, suggests that this is often not the case.

Measles is one of the most contagious viral diseases known and can be lethal, particularly in unvaccinated children. Yet, it remains entirely preventable with a highly effective vaccine, with an outstanding safety record established since the 1960s.