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Specifically that some of the motifs of the Covid-19 spike protein have similarity to syncytin-1, which if true might trigger an autoimmune response.
Looking at Protein Database for syncytin-1 https://cutt.ly/chQ27vQ
and for Cov-19 spike https://cutt.ly/ehQ9tlD
and running the FASTA through a sequence checker https://cutt.ly/chQ9szi
similarities are not particularity high at first glance. But I know very little about this.
difflogo.com also allows you to compare motifs but I was having trouble uploading the proper file type.
What is the similarity threshold for a protein to be considered a autoimmune risk?
Can someone with knowledge enlighten me?