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The change of IL-2 expression of CD4+ or CD8+ after morphine injection. A, The IL-2 expression of CD4+ after intravenous injection. B, The IL-2 expression of CD4+ after epidural injection. C, The IL-2 expression of CD4+ after spinal injection. D, The IL-2 expression of CD8+ after intravenous injection. E, The IL-2 expression of CD8+ after epidural injection. F, The IL-2 expression of CD8+ after spinal injection. IL = interleukin.
