Scientists have identified the brain cells that are most vulnerable to Alzheimer's disease for the first time, in what's being referred to as the 'holy grail' of dementia studies. The brain cells lie in a region known as the entorhinal cortex, which controls memory, navigation and time perception, and are the first to be killed off by the disease. The researchers hope the findings could be used to develop a new and much more targeted approach to developing therapies to slow or prevent the spread of Alzheimer's disease. The brain cells lie in a region known as the entorhinal cortex, which controls memory, navigation and time perception, and are the first to be killed off by the disease