Both "helper" (CD4) and "cytotoxic" (CD8) T-cell classes have been described.
现已明确两类T细胞：辅助性T细胞(CD4)和细胞毒性T细胞(CD8)。
2
Antibody production that is stimulated through increased helperT-cell function can activate complement.
通过增加辅助性T细胞的功能能够刺激抗体生成，活化补体。
3
The CD4 + test directly measures the abundance of the helpertcell, an of immune cell in the bloodstream distinguishable because they are the only ones that carry the CD4 marker.
CD 4 +试验直接检测辅助型T细胞数量。辅助型T细胞是血流中可分辨的免疫细胞中的一种，因为只有他们才具有CD 4标志物。