Compact biological entities with little more than a handful of genes and a protein coat, viruses lend themselves to engineering.
病毒是只有少数基因和蛋白外壳的紧凑型生物实体，对生物工程有很大作用。
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But experts say it will be very difficult to isolate this part of the protein from the virus to use in a vaccine, or to manufacture it using genetic engineering.
不过，专家们说，很难从病毒中分离出这部分蛋白质用于疫苗，或利用基因工程生产出这种蛋白质。
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The technique starts by engineering a cell that can produce a light-emitting protein that was first obtained from glowing jellyfish.