Https://www.nature.com/articles/s41541-017-0006-8#:~:text=Hecolin%2C%20the%20first%20prophylactic%20hepatitis,launched%20in%202012%20in%20China.&text=%20It%20is%20also%20the%20world's,synthesized%20on%20a%20commercial%20scale.&text=The%20neutralizing%20and%20immunodominant%20epitopes,the%20surface%20of%20p239%20VLPs.