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

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

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

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

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