Immunogen sequence: RRVPSIRSGD FQAPFQTSAA MHHPSQESPT LPESSATDSD YYSPTGGAPH GYCSPTSASY GKALNPYQYQ YHGVNGSAGS YPAKAYADYS YASSYHQYGG AYNRVPSATN QPEKEVTEPE VRMVNGKPKK VRKP. This gene encodes a member of a homeobox transcription factor gene family similar to