. "\"The change in morphology and behavior of a mature or immature natural killer T cell resulting from exposure to a mitogen, cytokine, chemokine, cellular ligand, or an antigen for which it is specific, leading to the initiation or perpetuation of an immune response.\" [GOC:add, PMID:15771592]" . . "NK T cell activation involved in immune response" . . . "natural killer T lymphocyte activation during immune response" . "natural killer T-cell activation during immune response" . "natural killer T-lymphocyte activation during immune response" . "NK T cell activation during immune response" . "NK T lymphocyte activation during immune response" . "NK T-cell activation during immune response" . "NK T-lymphocyte activation during immune response" . .