Abstract: The present invention provides a transgenic mouse which comprises a deficiency for murine T lymphocytes, B lymphocytes and NK cells, a deficiency for murine MHC class I and MHC class II molecules, and a functional xenogenic SIRP? transgene. This mouse is useful for in vivo screening of various compounds, including immuno-therapeutic agents and vaccines. The said mouse is also useful for testing the in vivo metabolism of xenobiotic compounds.

Abstract: The present invention provides a transgenic mouse which comprises a deficiency for murine T lymphocytes, B lymphocytes and NK cells, a deficiency for murine MHC class I and MHC class II molecules, and a functional xenogenic SIRP? transgene. This mouse is useful for in vivo screening of various compounds, including immuno-therapeutic agents and vaccines. The said mouse is also useful for testing the in vivo metabolism of xenobiotic compounds.

Abstract: The present invention provides a transgenic mouse which comprises a deficiency for murine T lymphocytes, B lymphocytes and NK cells, a deficiency for murine MHC class I and MHC class II molecules, and a functional xenogenic SIRP? transgene. This mouse is useful for in vivo screening of various compounds, including immuno-therapeutic agents and vaccines. The said mouse is also useful for testing the in vivo metabolism of xenobiotic compounds.

Abstract: The invention relates to a method of producing a multichimeric mouse comprising a functional xenogenic (human) immune system restricted to the MHC class I and/or class II molecules (HLA molecules) of the xenogenic species solely, and a functional tissue. The invention relates also th the use of the multichimeric mouse obtainable by said method, to study the immunopathogenesis of tissue-specific diseases (infectious, tumoral or auto-immune pathologies) and to their applications to design and test vaccines or immunotherapeutic agents against these pathologies.

Abstract: The invention relates to mice which are genetically deprived of T, B lymphocytes and NK cells, deficient for murine MHC class I and/or MHC class II molecules, and transgenic for the expression of the HLA class I and/or HLA class II molecules, and to their use as recipient hosts for the transplantation of human haematopoietic precursors, to study the human adaptative immune system development and function in vivo. The invention relates also to the applications of this human/mouse chimera model to improve immunotherapy against pathogens, cancer and autoimmune diseases.