For example, hypoxia‐associated transcription factor HIF1A and BBB transporter MFSD2A were found to be upregulated specifically in the vEC subset (Figure 2E), whereas INPP5D, a gene found upregulated in both AD and HD studies (Table S2A), was found to be altered specifically in cECs of the Yang et al. This evidence concerns the gene HIF1A and Alzheimer disease.