Immunogen sequence: MEDLEEDVRF IVDETLDFGG LSPSDSREEE DITVLVTPEK PLRRGLSHRS DPNAVAPAPQ GVRLSLGPLS PEKLEEILDE ANRLAAQLEQ CALQDRESAG EGLGPRRVKP SPRRETFVLK DSPVRDLLPT VNSLTRSTPS PSSLTPRLRS NDRKGSVRAL RATSGKRPSN MKRESPTCNL FPASKSPASS PLTRSTPPVR GRAGPSGRAA ASE