Immunogen sequence: SDQGFHITYL TSPSDLRCGG NYTDPEGELF LPELSGPFTH TRQCVYMMKQ PQGEQIQINF THVELQCQSD SSQNYIEVRD GETLLGKVCG NGTISHIKSI TNSVWIRFKI DASVEKASFR AVYQVACGDE LTGEGVIRSP FFPNVYPGE. Cubilin (CUBN) acts as a receptor for intrinsic factor-vitamin B12 co