Innate lymphoid cells(ILCs)are a newly identified subset of lymphocyte that are generated from common lymphoid.They are distinguished from the T cells and B cells by their lack of clonotypic antigen receptors.ILCs are early effectors of immunity that respond within hours after activation by a wide array of signals.ILCs are preferentially located at mucosal barrier surfaces.ILCs serve important roles in maintaining mucosal integrity,repair of damaged intestine,as well as in inflammatory response against infectious microorganisms.Here,the classification of ILCs,the developmental relationships be...