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https://archive.ph/VdpwJ https://archive.ph/Nfu5p https://archive.ph/az10E What was the “human-specific cleavage site”? It was the human ENaC alpha FCS peptide sequence, optimized for elevated immunogenicity of the nucleotide sequence and modified for maximal MHC class II binding for the peptide sequence. (Compared to the S1-S2 site in MERS-CoV, the QTQTNSPRRAR sequence especially as a cleaved sequence is a much more potent class II MHC epitope (CD4+ T cell epitope).) https://archive.ph/CFNcS

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