Everybody early in two thousand 20 kind of said, yes, let's build vaccines built around the spike protein. Because that's the key to the is how it latches on to the ty cells. So you want to introduce a protein that is key to that virus to educate the immune system. And they were right. For a long time, it was. It failed over and over again in attempts to implement itn in in well first and mice, right? And an another before he got to humans.