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Morphine treatment does not affect the percentages of T-cells that are naïve, central memory and effector memory cells. Mice were treated with morphine (M), morphine and naltrexone (M + N), naltrexone (N) or placebo (P). Splenocytes were labelled with anti-CD4, anti-CD8, anti-CD44 and anti-CD62L 7 days after pellet implantation. The percentages of CD4+ cells (A) and CD8+ (B) in each gate are shown. Data shown represent one mouse from each group.
