Well, this is an approach that's been used in a variety of vaccines, most successfully with Hepatitis B, so the problem is where do you get these proteins?

这种方式,已经为许多种疫苗使用,乙型肝炎疫苗是最成功的,但问题是该从哪里获得这些蛋白质呢

耶鲁公开课 - 生物医学工程探索课程节选