 The gene (E2A) that codes for proteins with the properties of immunoglobulin enhancer binding factors E12/E47 was mapped to chromosome region 19p13.2-p13.3, a site associated with nonrandom translocations in acute lymphoblastic leukemias.     ///    The gene for enhancer binding proteins E12/E47 lies at the t(1;19) breakpoint in acute leukemias.. 