Immunogen sequence: GVFEKFPKLK VCFAHGGGAF PFTVGRISHG FSMRPDLCAQ DNPMNPKKYL GSFYTDALVH DPLSLKLLTD VIGKDKVILG TDYPFPLGEL EPGKLIESME EFDEETKNKL KAGNAL. The neuronal excitotoxin quinolinate is an intermediate in the de novo synthesis pathway of NAD from tryp