IL17A and rheumatoid arthritis: The KEGG results showed that the main enrichment in the cytokine-cytokine receptor interaction, viral protein interaction with cytokine and cytokine receptor, chemokine signaling pathway, rheumatoid arthritis, IL−17 signaling pathway, neuroactive ligand-receptor interaction, NF−kappa B signaling pathway, and natural killer cell mediated cytotoxicity (Figure 1D).