Protracted and variable latency of acute lymphoblastic leukemia after TEL-AML1 gene fusion in utero..     ///    "Leukemic cells in both twins had a TEL-AML1 rearrangement, which was characterized at the DNA level by an adaptation of a long distance polymerase chain reaction (PCR) method. "    ///    "However, retrospective scrutiny of the DNA from an archived slide with clonotypic TEL-AML1 primers showed that the presumptive preleukemic clone was present and disseminated 9 years before a clinical diagnosis. "