However, reverse transcription-PCR for HLXB9-ETV6 demonstrated alternative splicing.     ///    The reciprocal ETV6-HLXB9 transcript was not detected.     ///    "It remains to be elucidated if the leukemic phenotype is attributable to the formation of the HLXB9-ETV6 fusion protein, which includes the helix-loop-helix and E26 transformation-specific DNA binding domains of ETV6 or to the disruption of the normal ETV6 protein.. "