>https://frontiersin.org/articles/10.3389/fviro.2022.834808/full
"The presence in SARS-CoV-2 of a 19-nucleotide RNA sequence encoding an FCS at amino acid 681 of its spike protein with 100% identity to the reverse complement of a proprietary MSH3 mRNA sequence is highly unusual. Potential explanations for this correlation should be further investigated."
proprietary MSH3 mRNA sequence
proprietary