Immunogen sequence: EGWHCTSEAC ESCVLHRSCS PGFGVKQIAT GVSDTICEPC PVGFFSNVSS AFEKCHPWTS CETKDLVVQQ AGTNKTDVVC GPQD. CD40 is a single-chain glycoprotein and a member of the tumor necrosis factor receptor (TNFR) family, exhibiting significant homology to the