FIG. 3.

The decay of absolute numbers of circulating Gag/Pol tetramer-binding cells in the subsets CD27⁺ CD45RO⁺ (A) and CD27⁻ CD45RO⁻ (B). In the four patients studied with late falls in Gag/Pol tetramer-binding cells, most of the loss could be accounted for by falls in the CD27⁺ CD45RO⁺ subset. Smaller declines were also observed in the CD45RO⁻ subset. Note that the y axes scales are different because the proportion of cells staining in the CD27⁻ CD45RO⁻ subset are considerably less than in the CD27⁺ CD45RO⁺ subset. Smaller declines were also observed in the CD45RO⁻ subset.