TSPO and ischemic stroke: The accumulation of microglia and infiltration of monocytes/macrophages into the brain after ischemic stroke has been demonstrated by translocator protein (TSPO) as a biomarker of positron emission tomography (PET) [87], and ultrasmall superparamagnetic particles of iron oxide (USPIO) as a biomarker of magnetic resonance imaging (MRI) [88].