Homology to region X from staphylococcal protein A is not unique to cell surface proteins.
von Heijne
G
G
Uhlén
M
M
D000595:Amino Acid Sequence; D002473:Cell Wall / Q000378:metabolism; D006801:Humans; D007256:Information Systems; D009842:Oligopeptides; D013205:Staphylococcal Protein A
D009842:Oligopeptides; D013205:Staphylococcal Protein A