Figure 7.

AQP4 immunogold labeling around human capillaries versus arterioles. Comparison of the two vessel segments with regard to (a) linear density of gold particles over the perivascular astrocytic endfoot membrane (endfoot membranes facing capillary endothelial cells and pericytes were pooled), (b) linear density of gold particles over the parenchymal astrocytic endfoot membrane (facing neuropil), and (c) AQP4 polarization index (ratio of labeling over perivascular versus parenchymal astrocytic membranes). Values are mean with 95% confidence interval, and differences between the species were determined by independent samples t test. There were no significant differences between peri‐capillary and peri‐arteriolar AQP4 labeling patterns.