Immunogen sequence: RDSKTSSAEV TIQNVIKLVD ELMEAPGDVE ALAPPVRHLI ATQLLSNLED IMRILAKSLP KGPFTYISPS NTELTLMIQE RGDKNVTMGQ. CD97 is a G-protein-coupled seven-span transmembrane adhesive receptor that is constitutively expressed on granulocytes and monocytes