specific amino acid sequence of that virus, namely the spike protein. that happens to be the one that mutates a lot. what we have done is we have created a vaccine against the one part of the virus that's easiest to vaccinate against but which happens to be the one part of the virus that mutates like crazy. coronavirus' aren't new. they've been around forever. this is what causes part of the common cold. we still get common cold all the time and you can bet if someone included vaccinated against the common cold, they would have done so already but we don't. why? because they mutate rapidly, especially the spike protein. what we really need to hope for is that we do get ultimately to some point where the virus mutates in a way that infects a lot of people but it doesn't cause any disease at all. >> laura: right. what we have said all along, it has to kind of run through the population, software that sounds, protect the people most vulnerable. it's a good lead into this preprint study that was