Figure 7. The milieu model.
In vivo evidence summarized in Discussion suggests that TGF-β is activated in separate neuronal-glial and vascular milieus in the CNS, with little or no diffusion of TGF-β between milieus (dotted lines). Furthermore, there is little spreading between microglia of TGF-β activated within the neuronal-glial milieu (dotted lines between microglia).