Immunogen sequence: EKPMEIARIV ARCLWEESRL LQTAATAAQQ GGQANHPTAA VVTEKQQMLE QHLQDVRKRV QDLEQKMKVV ENLQDDFDFN YKTLKSQGDM QDLNGNNQSV TRQKMQQLEQ MLTALDQMRR SIVSELAGLL SAMEYVQK. STAT3 belongs to the family of STAT (signal transducers and activators of transcr