For the same reason, peptide immunizations often elicit inadequate cytotoxic t lymphocyte (CTL) and antibody (Ab) responses due to the lack of appropriate helper t lymphocyte (HTL) activity.

因同样的理由，肽类免疫应答常因缺乏适当的辅助T淋巴细胞(HTL)而引导出不充分的细胞毒素T淋巴细胞(CTL)和抗体反应。

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Both drugs turn off a natural brake on immune system activity called CTLA4 (cytotoxic T-lymphocyte antigen 4).

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