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

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

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Disease Associated with Immune System
To treat HIV infections using drugs, the major problem is that

the drugs are rapidly degraded
the virus particles with altered (mutant) proteases arise
the drugs that are good inhibitors cannot by synthesized
the drugs interfere with normal digestion

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