To examine whether the t(8;21)-positive AMLs expressed a 94-kDa AML1-ETO, protein fractions isolated from leukemia blasts of 10 patients with t(8;21)-positive AML and the Kasumi-1 cells were analyzed by Western blotting.     ///    "Thus, t(8;21)-positive AMLs appear to overexpress the AML1-ETO fusion protein, which may be responsible for differentiation block and leukemogenesis in AML.. "    ///    Characterization of the ETO and AML1-ETO proteins involved in 8;21 translocation in acute myelogenous leukemia..     ///    We found that AML1-ETO blocked the erythroid differentiation of K562 cells induced by low doses of Ara-C.     ///    "Western blot analysis showed that ETO and AML1-ETO were identified as 70 kDa and 94 kDa proteins, respectively, and that both proteins, like AML1, were associated with the nuclear matrix. "    ///    "The biological significance of AML1-ETO was examined in K562 cells, which stably overexpress AML1-ETO. "    ///    "To understand the role of ETO and AML1-ETO in the pathogenesis of AML, the full length cDNAs of ETO and AML1-ETO were cloned and antibodies against AML1 and ETO proteins have been developed in our laboratory. "    ///    The 94 kDa AML1-ETO fusion protein was detected in all samples. 