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HTm4 up-regulation in human CD4+ T cells after PHA stimulation. Human peripheral blood cells were collected and incubated with or without PHA (1 μg/ml) for 72 hrs. The right-hand histograms show an increase in HTm4 staining (green tracing) in the CD4+ cells after PHA stimulation (upper panels), compared to CD4 cells without PHA stimulation (lower panels). Control Ig staining is depicted in blue.
