Immunogen sequence: MATVPGLQPL PTLEQDLEQE EILIVKVEED FCLEEEPSVE TEDPSPETFR QLFRLFCYQE VAGPREALSR LWELCCRWLR PELRTKEQIL ELLVLEQFLT VLPGEIQARV REQQPESGEE AVVLVEGLQR KPRKHRQRGS ELLSDDEVPL GIGGQFLKHQ AEAQPEDLSL EEEARFSSQQ PPAQLSHRPQ RGPLLWPERG PPAPRHQEMA SAS