Aquaporin-4 Comparative Images (image) Oregon Health & Science University Share Print E-Mail Caption Two images compare brain scans from an older individual who had Alzheimer's (on the left) with an older cognitively healthy individual (n the 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. Credit OHSU Usage Restrictions Credit to OHSU. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.