Immunogen sequence: EFDNGVEGLI EPLLKEAKFP ILSANIKAKG PLASQISGLY LPYKVLPVGD EVVGIVGYTS KETPFLSNPG TNLVFEDEIT ALQPEVDKLK TLNVNKIIAL GHSGFEMDKL IAQK. CD73, also known as Ecto-5-prime-nucleotidase or 5-prime-ribonucleotide phosphohydrolase, is an enzyme that