Immunogen sequence: MTRDQNGTWE MESNENFEGY MKALDIDFAT RKIAVRLTQT KVIDQDGDNF KTKTTSTFRN YDVDFTVGVE FDEYTKSLDN RHVKALVTWE GDVLVCVQKG EKENRGWKQW IEGDKLYLEL TCGDQVCRQV FKKK. RBP2 is an abundant protein present in the small intestinal epithelium. It is thought