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Schematic of study. Antiretroviral treatment (ART) is indicated by black bar, phosphate-buffered saline (PBS) or 1MT treatment is indicated by unshaded or shaded bars, respectively, and increasing doses of 1-methyl tryptophan (1mT) (see text) are indicated by varying shades of gray. The times of venipuncture, rectal biopsy, and jejunal resection are indicated by the corresponding arrows.
