市售角鲨烯提取自鱼油—尤其是鲨鱼肝油，提纯后可用于药物制品和疫苗。
Squalene is commercially extracted from fish oil, and in particular shark liver oil. Squalene used in pharmaceutical products and vaccines is purified from this source.
这病毒外部蛋白然后被提纯并产生几百到几千毫升的纯化病毒蛋白，作为抗原，是疫苗中的活性成分。
The outer proteins of the virus are then purified and the result is several hundred or thousand liters of purified virus protein that is referred to as antigen, the active ingredient in the vaccine.
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