**3. Natural killer T and γδ T cells**

The other two major innate lymphocyte populations are natural killer T (NKT) and γδ T cells. NKT cells primarily recognize lipid antigens presented by CD1d molecules. The γδ T cells represent a more diverse population and in many cases, the antigen specificity of these cells is not known. However, as discussed below, the γδ T cells known to be involved in experimental viral myocarditis are also CD1d restricted. For this reason, description of the CD1 family of molecules is provided followed by discussion of the NKT and γδ T cells in innate immunity.
