There is disclosed a chimeric mammal having a stable bone marrow graft of human hematopoietic cells capable of differentiating into multiple lineages of human mature cells, wherein at least 30% of the hematopoietic cells in the mammal's bone marrow are of human origin. The inventive method comprises sublethally irradiating an immunodeficient mammal, infusing human hematopoietic cells into the mammal and administering an effective amount of human mast cell growth factor (MGF) and a human granulocyte macrophage colony stimulating factor/interleukin-3 fusion protein (GM-CSF/IL-3 FP) to promote engraftment of human cells within the chimeric mammal's bone marrow.

É divulgado um mamífero chimeric que tem um graft estável do marrow de osso das pilhas hematopoietic humanas capazes de diferenciar-se em lineages múltiplos de pilhas maduras humanas, wherein ao menos 30% das pilhas hematopoietic no marrow de osso do mamífero são da origem humana. O método inventive compreende sublethally irradiating um mamífero immunodeficient, infusing pilhas hematopoietic humanas no mamífero e a administração de uma quantidade eficaz do fator humano do crescimento da pilha do mastro (MGF) e uma colônia humana do macrophage do granulocyte que estimula a proteína da fusão factor/interleukin-3 (GM-CSF/IL-3 FP) para promover o engraftment de pilhas humanas dentro do marrow de osso do mamífero chimeric.

 
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