Immunogen sequence: PGAPGPKGES GDYKATQKIA FSATRTINVP LRRDQTIRFD HVITNMNNNY EPRSGKFTCK VPGLYYFTYH ASSRGNLCVN LMRGRERAQK VVTFCDYAYN TFQVTTGGMV LKLEQGENVF LQATDKNSLL GMEGANSIFS GFLLFPDMEA. C1QB is a major constituent of the human complement subcomponent C1q