Arrowheads indicate features: red for positive astrocytes ( lefthand one shows cell processes associating with an arteriole/post-capillary venule??).

Black for positive capillary endothelial cells; green shows processes ( I assume astrocytes) actually associating with a capillary ( that has CD71-positive endothelium).

I am not sure if Astrocytes should be CD71-positive as I do not see this, patently, in rat sections under identical conditions.