Abundance of the 70R mutation and mutant genotypes with 70R under ZDV therapy.

<p><b>A</b>. Absolute abundance (in numbers) of the 70R mutation. <b>B</b>. Relative abundance of the 70R mutation in the viral population. The transient appearance and eventual fixation of the mutation 70R can be seen. <b>C</b>. Absolute abundance (in numbers) of mutant genotypes containing the mutation 70R. The absolute abundance of a certain mutation is calculated by adding all mutant genotypes containing the mutation.