Sure. In terms of the trial we're doing with CanSino, which may or may not be the first, depending on when the vaccine arrives, that vaccine is, as I'd mentioned before, an adenovirus 5, which is a normal human respiratory pathogen that causes an upper respiratory infection, that has been modified to express the spike protein to make the spike protein of the SARS-CoV-2 virus. Therefore, when the host sees that platform, it makes antibodies against the spike protein. Hopefully, that would then protect somebody who comes in contact with it. The adenovirus 5 has been modified so that it's a non-replicating virus, which means it doesn't replicate in the host.
So that's the platform. That's how it works.