Immunogen sequence: ERKETKAEEE LDAEVLEVFH PTHEWQALQP GQAVPAGSHV RLNLQTGERE AKLQYEDKFR NNLKGKRLDI NTNTYTSQDL KSALAKFKEG AEMESSKEDK ARQAEVKRLF RPIEELKKDF DELNVV. This gene encodes a resident endoplasmic reticulum (ER), N-linked glycoprotein with an N-termi