IL17A and infection: KEGG enrichment analysis showed a Delta-specific downregulation of a small set of components of proinflammatory interleukin-17 (IL-17) and TNF signaling pathways and cytokine-cytokine interaction, late in infection (Fig. 5H, Fig. S3B), indicating that Delta not only spares cytokine induction, but inhibits it at the later stages of infection.