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I don't even see how this experiment could have possibly demonstrated a "gain" of function (in terms of danger) - the original Wuhan coronavirus had a 100% fatality rate in these mice models. So if they had done this experiment and gotten a 100% fatality rate again...what's the conclusion?

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Making a 100% deadly virus more contagious, or from the other perspective, making an extremely contagious virus more deadly, certainly sounds like “gain of function” to me. In either case the virus under study has been made more dangerous / improved on its prior “function”, which was a likely outcome of the experiment. ¯\_(ツ)_/¯

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