To assess cellular localization, a representative ALS and ALS/FTD case was immunostained with antibodies against GFAP, HEPACAM, and MSN and TPP1, which displayed astrocytic and microglial cellular populations, respectively, consistent with the specific cell‐type expression of these protein markers (Fig EV4C). The gene discussed is TPP1; the disease is amyotrophic lateral sclerosis.