How the retroviral env gene has these effects is not clear.
逆转录病毒env基因为何拥有这种作用尚不清楚。
Although env gene correlates with cell tropism, coreceptor usage and HIV syncytium inducing, it may have relationship with the whole genome, whether these phenotypes are present or not.
虽然HIV外膜基因与毒株的细胞嗜性、受体使用，与介导融合等特性有关，但这些表型的体现与否，还与毒株的整个基因组背景有关。
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