What is the best explanation of why AZT slows the progression of HIV

Explanation:

(AZT) was the first antiretroviral drug used in HIV and AIDS. It is expensive and has several adverse effects including nausea, vomiting, blood problems and myopathy. The review of trials found that AZT does delay the early progression of HIV disease, but this improvement is not sustained. AZT alone does not increase survival for people without AIDS.

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the offspring would all be white. if the parents are both white flowers then they have the genotype rr, which when crossed results in an all white punnet square.