Immunogen sequence: ESASEAAKKY MEENDQLKKG AAVDGGKLDV GNAEVKLEEE NRSLKADLQK LKDELASTKQ KLEKAENQVL AMRKQSEGLT KEYDRLLEEH AKLQAAVDGP. BAP31 (B-Cell Receptor Associated Protein, 31-kDa) is a multiple membrane spanning protein of the endoplasmic reticulum. It