To elucidate the molecular biology of the hematopoietic stem cell, we have begun to isolate genes from murine cell populations enriched in stem cell activity. One such cDNA encodes a novel receptor tyrosine kinase, designated fetal liver kinase-2 or flk-2, which is related to the W locus gene product c-kit. Expression analyses suggest an extremely restricted distribution of flk-2. It is expressed in populations enriched for stem cells and primitive uncommitted progenitors, and is absent in populations containing more mature cells. Therefore, this receptor may be a key signal transducing component in the totipotent hematopoietic stem cell and its immediate self-renewing progeny.
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Queen Mary Univ London, William Harvey Res Inst, Barts & London Sch Med, Bone & Joint Res Unit, London EC1M 6BQ, EnglandQueen Mary Univ London, William Harvey Res Inst, Barts & London Sch Med, Bone & Joint Res Unit, London EC1M 6BQ, England
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Fdn San Raffaele del Monte Tabor, Div Regenerat Med Stem Cells & Gene Therapy, Milan, ItalyFdn San Raffaele del Monte Tabor, Div Regenerat Med Stem Cells & Gene Therapy, Milan, Italy
Gentner, Bernhard
Giustacchini, Alice
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Fdn San Raffaele del Monte Tabor, Div Regenerat Med Stem Cells & Gene Therapy, Milan, ItalyFdn San Raffaele del Monte Tabor, Div Regenerat Med Stem Cells & Gene Therapy, Milan, Italy
Giustacchini, Alice
Boccalatte, Francesco
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Fdn San Raffaele del Monte Tabor, Div Regenerat Med Stem Cells & Gene Therapy, Milan, ItalyFdn San Raffaele del Monte Tabor, Div Regenerat Med Stem Cells & Gene Therapy, Milan, Italy
Boccalatte, Francesco
Schira, Giulia
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Fdn San Raffaele del Monte Tabor, Div Regenerat Med Stem Cells & Gene Therapy, Milan, ItalyFdn San Raffaele del Monte Tabor, Div Regenerat Med Stem Cells & Gene Therapy, Milan, Italy
Schira, Giulia
Saini, Massimo
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Fdn San Raffaele del Monte Tabor, Div Regenerat Med Stem Cells & Gene Therapy, Milan, ItalyFdn San Raffaele del Monte Tabor, Div Regenerat Med Stem Cells & Gene Therapy, Milan, Italy
Saini, Massimo
Lechman, Eric
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Univ Hlth Network, Toronto, ON, CanadaFdn San Raffaele del Monte Tabor, Div Regenerat Med Stem Cells & Gene Therapy, Milan, Italy
Lechman, Eric
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Hiramatsu, Hidefumi
Dick, John E.
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Univ Hlth Network, Toronto, ON, CanadaFdn San Raffaele del Monte Tabor, Div Regenerat Med Stem Cells & Gene Therapy, Milan, Italy
Dick, John E.
Naldini, Luigi
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Fdn San Raffaele del Monte Tabor, Div Regenerat Med Stem Cells & Gene Therapy, Milan, ItalyFdn San Raffaele del Monte Tabor, Div Regenerat Med Stem Cells & Gene Therapy, Milan, Italy