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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