We all know that the mRNA gets inside the cells and produces the spike protein. But what then? How do we go from viral spike proteins inside cells to creating anitibodies against them? This is where it gets good. What happens is that these spike proteins migrate to the surface of the cell and sit there. Now that the cells have these viral spike protein on the surface, your own immune system attacks and kills the cells. This isn't how conventional vaccines work at all! Your body attacking itself is by definition an autoimmune reaction. If the spike protein get manufactured in your heart cells, your immune system attacks the heart. If it happens in the livery, your immune system attacks the liver.