Immunogen sequence: MARVLKAAAA NAVGLFSRLQ APIPTVRASS TSQPLDQVTG SVWNLGRLNH VAIAVPDLEK AAAFYKNILG AQVSEAVPLP EHGVSVVFVN LGNTKMELLH PLGRDSPIAG FLQKNKAGGM HHICIEVDNI NAAVMDLKKK KIRSLSEEVK IGAHGKPVIF LHPKDCGGVL VELEQA. MCEE catalyzes the interconversion of D