Immunogen sequence: VTVTVGGSGG DKGSGFPDGE GSSRRPTLTT FFGRRKSRQG SLAMEELKSG SGPSLKGEEE PLVASEDGAV DAPAPDEPEG. CD43, also known as leukosialin or sialophorin, is a transmembrane mucin-like protein characterized by a high negative charge. It is expressed on