Immunogen sequence: MSNALAIQVD SEGKIKYDAI ARQGQSKDKV IYSKYTDLVP KEVMNADDPD LQRPDEEAIK EITEKTRVAL EKSVSQKVAA AMPVRAADKL APAQYIRYTP SQQGVAFNSG AKQRVIRMVE MQKDPMEPPR FKINKK. CSTF2 is one of three (including CSTF1 and CSTF3) cleavage stimulation factors whic