S100A9 and psoriasis: scRNA‐seq analysis indicated that IR‐induced Ccr6 mRNA was primarily expressed by cells within the αβT/ILC cluster and that irradiation strikingly upregulated Ccl20 mRNA, as well as IL‐17‐induced psoriasis‐related chemokines and antimicrobial peptides, including, S100A8, and S100A9 (Furue et al, 2020) that localized predominantly within epidermal keratinocyte clusters (Fig 5A and Appendix Fig S13A).