RAG2 and colitis: To investigate the effects of B/T/ILCs in liver injury‐aggravated colitis, we administrated CCl4, along with or without NMN supplementation, to mice lacking T and B cells (Rag2–/–) or those deficient in T, B cells, and ILCs (Rag2–/–Il2rg–/–),[25, 26] followed by DSS feeding.