We might be able to stratify the data on the basis of gender, or by disease. For example, the signature of Alzheimer's disease changes over time. It's a degenerative disease which has an increasing effect on the brain. We know what an Alzheimer's brain looks like, but what we really want to do is find out what a Alzheimer's brain looks like before the disease manifests itself. That could allow doctors to begin treatment early ... The most important thing is to have an applicable general database against which we can compare disease populations ... We want to have an understanding of the brain that's more comprehensive than we have now.