Nature Reviews Neuroscience 16, 249–263 (2015)

In Figure 3 (left panel) of this article, the interleukins (ILs) being released from the astrocyte functional barrier into the perivascular space (PVS) and subarachnoid space (SAS) should have been listed as IL-1β, IL-6, IL-7, IL-11, IL-15 etc. The article has been corrected online.