他们检测了一些这样的人的白血球，也叫淋巴细胞，是免疫系统的一个重要部分。
They examined some white blood cells, called lymphocytes, which are an important part of the immune system.
其中的一个区域，定位在表面的棘突上，是HIV病毒用来接触免疫细胞并且感染它们时使用，叫做CD 4结合位点。
One such area, located on the surface spikes used by HIV to attach to immune system cells and infect them, is called the CD4 binding site.
红细胞免疫是临床免疫学的一个重要部分。
Immunity of erythrocyte is one important part of clinical immunology.
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