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(a) Boxplot of the ratio of elbow flexors over elbow extensors is low in macaques compared to gibbons (p < .001). (b, c) Boxplots of the relative PCSA of the biceps and triceps brachii. Within the hylobatid group, the triangles represent the siamangs. (b) The m. triceps brachii has a significantly higher PCSA in macaques compared to gibbons (p < .001). (c) The m. biceps brachii has a slightly higher relative PCSA in gibbons compared to macaques (p < .05)
