Immunogen sequence: MAHAMENSWT ISKEYHIDEE VGFALPNPQE NLPDFYNDWM FIAKHLPDLI ESGQLRERVE KLNMLSIDHL TDHKSQRLAR LVLGCITMAY VWGKGHGDVR KVL. IDO1 is an intracellular heme-containing enzyme that catalyzes the oxidative cleavage of the indole ring of several imp