Sequence of SARS-CoV-2 S glycoprotein residues with a Levenshtein Distance above 0.7. The normalized count for similar sequences as found in the library of 776 heparin binding proteins. The higher the normalized count, the more often a sequence was identified among the protein set. Basic amino acids are identified; arginine (blue), lysine (red) and histidine (green). AA No; amino acid number. AA; amino acid identity. HBP; relative frequency of sequence among heparin binding proteins. The region highlighted in blue shows residues 241–247 count with a cut-off of 0.65.