Immunogen sequence: DKQGKSRGHS IKTLELNVLV PPAPPSCRLQ GVPHVGANVT LSCQSPRSKP AVQYQWDRQL PSFQTFFAPA LDVIRGSL. ESAM is a 55-kDa membrane protein composed of 2 extracellular Ig domains, a single transmembrane domain, and a 120 amino acid cytoplasmic domain. E