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       #Post#: 293--------------------------------------------------
       PRRA
       By: gsgs Date: April 13, 2021, 1:22 am
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       PRRA [nucleotides CTCCTCGGCGGG or TCCTCGGCGGGC, depending how
       you align ]
       is the amino-acid-furin cleavage site ("FCS") inserted into
       SARS2 at the S1-S2 border in the spike protein.
       It is not seen in the similar bat or pangolin viruses, so ir was
       speculated that it was
       inserted in a lab , as done in similar experiments on
       IBV=infectious bronchitis virus,
       a coronavirus in birds, for which they are trying to create
       chicken-vaccines.
       there are 2 such FCS in some coronaviruses :
       [code]
       CTCCTCGGCGGG = insertion
       TCTCCTCGGCGGGCACGT , SARS2  , spike , 2038-2055
       S  P  R  R  A  R
       AAACCAAGCAAGAGGTCATTTATTGAAGATCTACTTTTC , SARS2,spike,2431-2469
       K  P  S  K  R  S  F  I  E  D  L  L  F
       AGTCCTAGAAGGCGTTCTTTTATTGAAGACCTTCTATTT , IBV
       ,spike,2056-2094,AY761141
       S  P  R  R  R  S  F  I  E  D  L  L  F
       AGTCCTAGAAGGCG
       CTCCTCGGCGGG
       x----x-xx--x
       [/code]
  HTML https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5413309/
  HTML https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6832359/pdf/viruses-11-00972.pdf
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