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Article in post #1,780 has a link for this report:
Balamurali & Ambati
'....The presence in SARS-CoV-2 of a 19-nt RNA sequence encoding an FCS (furin cleavage site) at amino acid 681 of its spike protein with 100% identity to the reverse complement of a proprietary MSH3 mRNA sequence is highly unusual.'
Balamurali & Ambati
MSH3 Homology and Potential Recombination Link to SARS-CoV-2 Furin Cleavage Site
Among numerous point mutation differences between the SARS-CoV-2 and the bat RaTG13 coronavirus, only the 12-nucleotide furin cleavage site (FCS) exceeds 3 nucleotides. A BLAST search revealed that a 19 nucleotide portion of the SARS-CoV-2 genome encompassing the furin cleavage site is a 100%...
frontiersin.org