| immunodeficient | Those diseases in which immune reactions are suppressed or reduced. Reasons may include congenital absence of B and/or T lymphocytes or viral killing of helper lymphocytes (see HIV). (18 Nov 1997) |
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| severe combined immunodeficient mice | Mice that lack both T and B lymphocytes and are used for transplantation and study of human lymphoid tissues resulting in a SCID-human mouse chimera. See: severe combined immunodeficiency. (05 Mar 2000) |
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