Disease Associated with Immune System
Combined cellular and humoral immune deficiencies result from lack of all of the following except

a thymus
class II MHC
HIV infection of CD4+ T cells
transporter of antigen peptides (TAP)

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Disease Associated with Immune System
Difficulties with somatic gene therapy arise from all of the following except

inserting a gene so that it will function properly
limited life span of more mature hematopoietic cells
GVHD caused by mature T cells in the transplanted cells
transducing genetic material into stem cells

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