Immunogen sequence: LNELVDFYRT TTIAKKRQIF LRDEEPLLKS PGACFAQAQF DFSAQDPSQL SFRRGDIIEV LERPDPHWWR GRSCGRVGFF PRSYVQPVHL; Positive Samples: U-251MG, A-549. This gene encodes a member of the GRB2/Sem5/Drk family. This member functions as a cytoplasmic signa