免疫系统中的淋巴细胞一般分为3种类型: ①在胸腺中分化的T淋巴细胞；②产生抗体的B淋巴细胞；③自然杀伤细胞。目前又发现第4类淋巴细胞，即NKT细胞〔1〕。NKT细胞是一群独立的细胞。它们既表达T细胞的表面标志又表达NK细胞的表面标志。大部分学者认为NKT细胞的表面标志为CD3i Lymphocytes in the immune system are generally divided into three types: (1) T lymphocytes that differentiate in the thymus; (2) B lymphocytes that produce antibodies; and (3) natural killer cells. At present, we have found that type 4 lymphocytes, NKT cells [1]. NKT cells are a group of independent cells. They express both the surface marker of T cells and the surface marker of NK cells. Most scholars believe that NKT cells surface markers CD3i