Rabbit Anti-Human ABL1 polyclonal antibody for IHC-P. The c-Abl proto-oncogene encodes a protein tyrosine kinase that is located in the cytoplasm and nucleus. In chronic myelogenous leukemia and in a subset of acute lymphoblastic leukemias, the c-Abl proto-oncogene undergoes a (9; 22) chromosomal translocation producing a novel rearranged chromosome (the Philadelphia chromosome) ; as the result of the fusion of c-Abl sequences from chromosome 9 to the Bcr gene on chromosome 22. The molecular consequence of this translocation is the generation of a chimeric Bcr/Abl mRNA encoding activated Abl protein tyrosine kinase.