CD63 and Alzheimer disease: The lysosomal membrane proteins CD63, damage-regulated autophagy modulator (DRAM), lysosomal integral membrane protein 2 (LIMP-2), Niemann–Pick type C1 (NPC1), synaptotagmin 7 (SYT7) and vacuolar-type H+-ATPase (V-ATPase) were present in the CSF, with a tendency toward increased levels of CD63, DRAM and V-ATPase in AD patients.