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era of COVID. And it has to do with the 20 amino acids. There are 20 of them that make up human proteins. And H-M has, and there are two amino acids, phenylalanine and arginine. They have something interesting in common that is unique to the two of them. And it has nothing to do with their biochemistry, not with, but it's nonetheless interesting. What is that thing they have in common? And how did it, more of an interesting point, how did it get to be that way? This one, you may want to actually ponder through a Google search. But don't cheat and ask AI.