Immunogen sequence: SISAGIPKVG VLMESVWNMN DSCRFQLRSP ESLKNMEKAS KTTEAKPESK QEPVKTEMGP PPSPASTCSD ASSIASSASM PYKRRRSTPA PKEEEKVNEE QWSLREVVFV EDVKNVPVGK VLKVDGAYVA VKFPGTSSNT NCQNSSGPDA DPSSLLQDCR LLRIDELQVV KTGGTPKVPD CFQRTPKKLC IPEKTEILAV NVDSKGVHAV L;