In addition, DEGs were significantly enriched in steroid hormone biosynthesis, olfactory transduction, PPAR signaling pathway, hematopoietic cell lineage, neuroactive ligand–receptor interaction, serotonergic synapse, arachidonic acid metabolism, linoleic acid metabolism, type 2 diabetes mellitus, ovarian steroidogenesis, glutamatergic synapse, metabolism of xenobiotics by cytochrome P450 and axon guidance in the KEGG pathway analysis (Figure 4c). Here, PPARA is linked to type 2 diabetes mellitus.