SLC1A2 and Alzheimer disease: In the N-N and AD-N groups, the expression of GLT-1 was strong in both the proximal and distal astrocytic processes in layer I/II and layer III-VI, while GLT-1 expression was weaker, especially in the distal astrocytic processes, in the AD-D group (Figs 4c, 5b and Supplementary Figure 4b).