Immunogen sequence: TNSISRQKQI FLRDRTREDQ GHRGNSLDRR SQGGPHLSGA VGEEIRPSMN RKLSDHPPTL PLQQHQHQPQ PPQYAPAPQQ LQQPPQQRYL QHHHFHQERR GGSLDINDGH CGTGLGSEMN AALMHRRHTD PVQLQAAGRV RWARALYDFE. This gene encodes a member of the GRB2/Sem5/Drk family. This member