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 _    _    _    _      _____    _____             
| \  / || | || | ||   / ___//  |  ___||     ___   
|  \/  || | || | ||   \___ \\  | ||__      /   || 
| .  . || | \\_/ ||   /    //  | ||__     | [] || 
|_|\/|_||  \____//   /____//   |_____||    \__ || 
`-`  `-`    `---`   `-----`    `-----`      -|_|| 
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Text this: The polybasic insert, the RBD of the SARS-CoV-2 spike protein, and the feline coronavirus – evolved or yet to evolve