GFAP and COVID-19: The degree of reactive astrogliosis as reflected by immunohistochemistry for glial fibrillary acidic protein (GFAP) tended to be more pronounced in the white matter when compared with the grey matter – a finding which parallels the experience from daily neuropathological diagnostic work and which we have demonstrated to be present in COVID‐19 patients and controls (Figure 3 and Supplementary figure 1).10