Immunogen sequence: NNMDQRSLPE DSLNSLIIKL IQADILKNKL SKQMVDVKEN YQSTLPKAEA PREPERGGPA KSAFQPVIAM DTELLRQQRR YNSPRVLLSD STPLEPPPLY LMEDYVGSPV VANRTSRRKR YAEHKSHRGE YSVCDSESLW VTDKSSAIDI RGHQVTVLGE IKTGNSPVKQ YFYETRCKEA RPVKNGCRGI DDKHWNSQCK TSQTYVRALT SEN