In two of the four cases, an AML1/ETO chimeric fragment was detected by reverse transcription and polymerase chain reaction (RT-PCR), and its sequence was found to be identical to that from patients with a cytogenetically proved t(8;21).     ///    Correlation between cell morphology and expression of the AML1/ETO chimeric transcript in patients with acute myeloid leukemia without the t(8;21).. 