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您请求的操作仅限于组中的用户:== T细胞==[[文件:淋巴细胞活化简单。png|612x612px|alt=|拇指|淋巴细胞活化:抗原呈递细胞(APC)，主要组织相容性复合体，]]T细胞淋巴细胞不同于B细胞和自然杀伤细胞，因为它们的细胞膜上有一种叫做T细胞受体的蛋白质。t细胞受体能够识别各种类型的特定抗原(引起免疫反应的物质)。与B细胞不同，T细胞不利用抗体来对抗细菌。T细胞起源于[[骨髓|骨髓]]，成熟于[[胸腺]]。T细胞在胸腺中繁殖并分化为辅助T细胞、调节T细胞或细胞毒性T细胞或成为记忆T细胞。然后它们被送到外周组织或在[[血液生理学|血液]]或[[淋巴系统|淋巴系统]]中循环。在适当抗原的刺激下，辅助性T细胞分泌[[细胞因子]]，刺激B细胞分化为浆细胞(产生抗体的细胞)。调节性T细胞(顾名思义)的作用是控制免疫反应。细胞毒性T细胞被各种细胞因子激活，结合并杀死被感染的细胞和癌细胞。*细胞毒性T细胞(也称为CD8+ T细胞)-参与直接破坏已经癌变或被病原体感染的细胞。 Cytotoxic T cells contain granules (sacs containing digestive enzymes or other chemical substances) that they utilize to cause the target cell to burst open in a process called [[apoptosis]]. * Helper T cells (also called CD4+ T cells) - precipitate the production of antibodies by B cells and also produce [[cytokines]] that activate cytotoxic T cells and white blood cells known as macrophages. CD4+ cells are targeted by [[Human Immunodeficiency Virus (HIV)|HIV]]. HIV infects helper T cells and destroys them by triggering signals that result in T cell death. * Regulatory T cells (also called suppressor T cells) - suppress the response of B cells and other T cells to antigens. This suppression is needed so that an immune response does not continue once it is no longer needed. * Memory T cells - help the immune system to recognize previously encountered antigens and respond to them more quickly and for a longer period of time. Helper T cells and cytotoxic T cells can become memory T cells. Memory T cells are stored in the [[Lymphatic System|lymph]] nodes and spleen and may provide lifetime protection against a specific antigen in some casesThought co. [https://www.thoughtco.com/t-cells-meaning-373354 T cells] Available from:https://www.thoughtco.com/t-cells-meaning-373354 (last accessed 13.1.2021).

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