It is assumed that the reason resulting in such change is either t cell maturation of the down regulation of t cell antigen receptors.

推测造成这种T细胞亚群变化的原因可能与T细胞的发育成熟及T细胞本身的调节有关。

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The T cell arrives at the target organ, the recognition transplant foreign body antigen, starts a series of changes.

细胞到达靶器官、识别移植的异体抗原，启动一系列变化。

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T cell can only recognize specific antigenic peptide-MHC complex on antigen-presenting cell. This is MHC restriction in antigen recognition of t cell.

细胞只能识别抗原提呈细胞表面特定的抗原肽MHC分子复合物，这就是T细胞抗原识别的MHC限制。

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Now, for antibody production it is still a T-cell that recognizes the antigen presenting cell.

现在,抗体的产生,仍是源于T淋巴细胞识别出抗原呈递细胞

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Because it has MHC-1, your MHC-1 on it, this T-cell recognizes that it's one of your cells but it has a foreign antigen associated with it.

因为该细胞上有MHC-1,T细胞将这些细胞识别为自身细胞,但这些细胞带有异己抗原

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Immune cells recognize it, and they recognize it by a very special form of receptor-ligand interaction where the ligand is MHC1 with the foreign antigen and the receptor is a receptor called the T-cell receptor complex.

免疫细胞识别出染病细胞,通过一种特殊形式的,受体配体协作机制识别出来,其中的配体是同,外源抗原共同出现的MHC1,而这其中受体是T细胞受体复合体

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However, before the alarm can be sounded in this way, proteins on the surface of the antigen-presenting cell and the T cell must bind together in what is called a cellular handshake.

ECONOMIST: Breaching the body's defences

For a T cell to become active, it must receive signals from another part of the immune system called an antigen-presenting cell.

ECONOMIST: Breaching the body's defences