CD99L2 and Alzheimer disease: The levels of some synaptic proteins in iNPH patients were close to C levels, and they strongly increased in AD, whereas L1 cell adhesion molecule (L1CAM), CD99 antigen-like protein 2 (CD99L2), Thy-1 membrane glycoprotein (THY1), neuronal pentraxin receptor (NPTXR), 14-3-3 protein zeta/delta (YWHAZ), reticulon-4 receptor (RTN4R), secretogranin-2 (SCG2) were more abundant in iNPH than in AD (Figure 5B).