Immunogen sequence: HKEAKIEEQE EQRKVQQLMT KEKRRPGVQR VDEGGWNTVQ GAKNSRVLDP SKFLKITKPT IDEKIQLVPK AQLGSWGKGS SGGAKASETD ALRSSASSLN RFSALQPPAP SGSTPSTPVE FDSRRTLTSR GSMGREKNDK PLPSATARPN TFMRGGSSKD LLDNQSQEEQ RREMLETVKQ LTGGVDVERN STEAERNKTR E; Positive Sa