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In the Fauci emails, a reply from a scientist, in the beginning of the pandemic, states a "recipe" on how the virus could have been changed in a lab

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They probably meant RNA code of the virus. Since if you know it you can produce it in a lab and introduce it into cells and they will manufacture functional copies of the virus.

It's not a recipe to create virus in a lab. It's a recipe to manufacture copies of the virus in a lab.

SARS CoV grows on VERO substrate, so it's relatively easy to make mutations of the virus. Here is example for IBV CoV: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2898227/

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