Xg glycoprotein (Xg blood group) MESWWGLPCL AFLCFLMHAR DIYPKPKPPY YPQPENPDSG GNIYPRPKPR PQPQPGNSGN SGGYFNDVDR DDGRYPPRPR PRPPAGGGGG GYSSYGNSDN THGRGGYRLN SRYGNTYGGD HHSTYGNPEG NMVAKIVSPI VSVVVVTLLG AAASYFKLNN RRNCFRTHEP ENV