Expression levels of IL8RB, a gene involved in the inflammatory immune response, in rhesus macaque monkeys of different dominance rankings (1 is the highest and 5 is the lowest). For each dominance rank, IL8RB expression levels are shown for 9 or 10 monkeys. Each monkey within a dominance rank was from a different social group. Scientists created social groups with one monkey from each rank. The gene expression levels are shown relative to the mean (shown as 0.0) of IL8RB expression for all 49 monkeys across all 10 groups. The trend line has a p-value of 0.003
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Figure 2B from:
J. Tung et al. (2012) social environment is associated with gene regulatory variation in the rhesus macaque immune system. PNAS, 109(17), 6490–6495.