NINJ1 and Acute hepatitis: Based on our observation that serum TNF‐α levels of Ninj1 conventional KO mice were lower than those of WT mice after 5 h of LPS/D‐gal treatment, we supposed lack of Ninj1 in myeloid‐lineage cells, including macrophages, had attenuated the severity of acute hepatitis by reducing TNF‐α production.