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Ｔ细胞在胸腺中生长发育成初始型Ｔ细胞(ｎａｉｖｅＴｃｅｌｌ)后,通过循环流经全身血液及次级淋巴器官,搜寻抗原呈递细胞(ａｎｔｉｇｅｎｐｒｅｓｅｎｔｉｎｇｃｅｌｌ,ＡＰＣ)呈递的抗原。初始型Ｔ细胞发现其特异抗原后,即增殖分化为具有新的迁移能力的效应Ｔ细胞和记忆Ｔ细
After T cells grow and develop into naive T cells in the thymus, antigens presented by antigen presenting cells (APCs) are searched by circulating through the whole blood and secondary lymphoid organs. When the initial type T cells find their specific antigen, they proliferate and differentiate into effector T cells with a new migration ability and memory T cells