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Memory T-cell analysis in SHIV-1157ip-infected monkeys. The percentage of CD4+ CD29+ memory T cells was stable in animals infected with SHIV-1157ip alone but decreased over time in coinfected macaques. Generalized estimation equations were used to model the data collected over time (P = 0.05). The dotted line represents the lower limit of normal for the percentage of CD4+ CD29+ memory T cells. SEM, standard error of the mean.
