Two images compare brain scans from an older individual who had Alzheimer's (left) with an older cognitively healthy individual (right). The red fluorescence is the membrane protein aquaporin-4. The cognitively healthy individual has relatively even aquaporin-4 expression throughout the tissue and a stark enhancement of expression around the blood vessel, whereas the individual with Alzheimer's has uneven, "patchy" expression of aquaporin-4. (OHSU)
