Immunogen sequence: RWDDGLRHLV MLSFGPDQLQ DLGQHVHVGG RLLAADSQPW GGPFRGCLQD LRLDGCHLPF FPLPLDNSSQ PSELGGRQSW NLT Highest antigen sequence identity to the following orthologs: Mouse - 72%, Rat - 75%. CRB2 (Crumbs homolog 2), like its homologs CRB1 and CRB3