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Mean genital (▴) and plasma (▪) and antiretroviral drug concentrations (C24h) by menstrual cycle phase (N = 63) and total (N = 96) for FTC (A), TFV (B), and ATV (C), N = 96. Abbreviations: ATV, atazanavir; CI, confidence interval; FTC, emtricitabine; TFV, tenofovir.
