WEE1 and Parkinson disease: While regarding the male gut bacterial group, processes related to lysine biosynthesis, arginine and proline, glutathione, retinol metabolism, ubiquinone and other terpenoid-quinone biosynthesis, and protein kinases at the level-3 classification of KEGG pathways were significantly enhanced (Figure 6D), In addition, as for the female gut bacterial groups, the expression of disease-related functional genes (e.g., Alzheimer's, Parkinson's disease, and renal cell carcinoma) were significantly high (p-value < 0.05, Figure 6C).