Immunogen sequence: YQVSQQQRQD QHSVVGQNTG PSPSPNPCSN PNTGSGYMNS QQSLLNQQLM GKKQTLQRQI MEQKQQLLLQ QQMLADAEKI APQDQINR Highest antigen sequence identity to the following orthologs: Mouse - 89%, Rat - 89%. Acts as a transcriptional coactivator for NOTCH pro