Furthermore, in PD, CYP27B1 labeled a subpopulation of parenchymal astrocytes with long processes and varicosities that resembled the varicose projection astrocytes exclusively found in human brain (Figure 1 B,C, Figure 2 E‐E′′′ and Figure 5 A).24, 25. The gene discussed is CYP27B1; the disease is Parkinson disease.