Immunogen sequence: EDDLFLHKSL SASTSKRLEA AFRSTPPGMD LSLAPPPRER PASSSSSPLG CFEPADPEGA GLLLPPP Highest antigen sequence identity to the following orthologs: Mouse - 91%, Rat - 93%. BHLHB5 inhibits DNA binding of TCF3/E47 homodimers and TCF3 (E47)/NEUROD1