Interesting research here. The spike itself may be the problem.
https://www.mdpi.com/2076-393X/9/1/36/htm
Thanks. I skimmed over it and had a hard time figuring out its import. I’ll read it more closely. Seems they are concerned about the cells that the spike protein binds with and what may happen as those cells reproduce over time. If I read it right, there is just no possible way to know yet. ‘Time will tell’.