Immunogen sequence: RPDHIYDEPE GVAALSLYDS PQEPRGEAWR RQATADRDPA GLQHVQPAGQ DFSASGWQPG TEYDNVVLKK GPK. The protein encoded by this gene is constitutively tyrosine phosphorylated in hematopoietic progenitors isolated from chronic myelogenous leukemia patie