64 shared downregulated genes between herpes keratitis and PD are found as in Figure 3(b), detail seen in Supporting Table S9, and the pathway analysis on the shared downregulated gene set was mainly enriched in “WP3888: VEGFA VEGFR2 signaling,” “GO:0072089: stem‐cell proliferation,” “G0:0034764: positive regulation of transmembrane transport,” “G0:0010720: positive regulation of cell development,” and “G0:0044089: positive regulation of cellular component biogenesis,” as in Figure 3(d), detail seen in Supporting Table S11. Here, VEGFA is linked to Parkinson disease.